diff --git a/lib/endpoint/overrides/workarounds.js b/lib/endpoint/overrides/workarounds.js
index 6f95fb347b..f8d5706000 100644
--- a/lib/endpoint/overrides/workarounds.js
+++ b/lib/endpoint/overrides/workarounds.js
@@ -154,6 +154,36 @@ function gistWorkarounds(route) {
   const { operation } = route;
   const restPattern = route.method + " " + route.path;
 
+  const gistFiles = {
+    type: "object",
+    additionalProperties: {
+      type: "object",
+      properties: {
+        filename: { type: "string" },
+        type: { type: "string" },
+        language: { type: "string" },
+        raw_url: { type: "string" },
+        size: { type: "number" },
+        truncated: { type: "boolean" },
+        content: { type: "string" },
+      },
+    },
+  };
+
+  const gistBaseFiles = {
+    type: "object",
+    additionalProperties: {
+      type: "object",
+      properties: {
+        filename: { type: "string" },
+        type: { type: "string" },
+        language: { type: "string" },
+        raw_url: { type: "string" },
+        size: { type: "number" },
+      },
+    },
+  };
+
   // Allows you to update or delete a gist file and rename gist files.
   // Files from the previous version of the gist that aren't explicitly
   // changed during an edit are unchanged.
@@ -179,27 +209,17 @@ function gistWorkarounds(route) {
         },
       },
     };
+
+    operation.responses[200].content[
+      "application/json"
+    ].schema.properties.files = gistFiles;
   }
 
   // see https://developer.github.com/v3/gists/#get-a-gist
   if (restPattern === "GET /gists/:gist_id") {
     operation.responses[200].content[
       "application/json"
-    ].schema.properties.files = {
-      type: "object",
-      additionalProperties: {
-        type: "object",
-        properties: {
-          filename: { type: "string" },
-          type: { type: "string" },
-          language: { type: "string" },
-          raw_url: { type: "string" },
-          size: { type: "number" },
-          truncated: { type: "boolean" },
-          content: { type: "string" },
-        },
-      },
-    };
+    ].schema.properties.files = gistFiles;
   }
 
   // Allows you to add a new gist with one or more files.
@@ -224,117 +244,47 @@ function gistWorkarounds(route) {
 
     operation.responses[201].content[
       "application/json"
-    ].schema.properties.files = {
-      type: "object",
-      additionalProperties: {
-        type: "object",
-        properties: {
-          filename: { type: "string" },
-          type: { type: "string" },
-          language: { type: "string" },
-          raw_url: { type: "string" },
-          size: { type: "number" },
-          truncated: { type: "boolean" },
-          content: { type: "string" },
-        },
-      },
-    };
+    ].schema.properties.files = gistFiles;
   }
 
   // see https://developer.github.com/v3/gists/#get-a-specific-revision-of-a-gist
   if (restPattern === "GET /gists/:gist_id/:sha") {
     operation.responses[200].content[
       "application/json"
-    ].schema.properties.files = {
-      type: "object",
-      additionalProperties: {
-        type: "object",
-        properties: {
-          filename: { type: "string" },
-          type: { type: "string" },
-          language: { type: "string" },
-          raw_url: { type: "string" },
-          size: { type: "number" },
-          truncated: { type: "boolean" },
-          content: { type: "string" },
-        },
-      },
-    };
+    ].schema.properties.files = gistFiles;
   }
 
   // see https://developer.github.com/v3/gists/#list-gists-for-the-authenticated-user
   if (restPattern === "GET /gists") {
     operation.responses[200].content[
       "application/json"
-    ].schema.items.properties.files = {
-      type: "object",
-      additionalProperties: {
-        type: "object",
-        properties: {
-          filename: { type: "string" },
-          type: { type: "string" },
-          language: { type: "string" },
-          raw_url: { type: "string" },
-          size: { type: "number" },
-        },
-      },
-    };
+    ].schema.items.properties.files = gistBaseFiles;
   }
 
   // see https://developer.github.com/v3/gists/#list-public-gists
   if (restPattern === "GET /gists/public") {
     operation.responses[200].content[
       "application/json"
-    ].schema.items.properties.files = {
-      type: "object",
-      additionalProperties: {
-        type: "object",
-        properties: {
-          filename: { type: "string" },
-          type: { type: "string" },
-          language: { type: "string" },
-          raw_url: { type: "string" },
-          size: { type: "number" },
-        },
-      },
-    };
+    ].schema.items.properties.files = gistBaseFiles;
   }
 
   // see https://developer.github.com/v3/gists/#list-starred-gists
   if (restPattern === "GET /gists/starred") {
     operation.responses[200].content[
       "application/json"
-    ].schema.items.properties.files = {
-      type: "object",
-      additionalProperties: {
-        type: "object",
-        properties: {
-          filename: { type: "string" },
-          type: { type: "string" },
-          language: { type: "string" },
-          raw_url: { type: "string" },
-          size: { type: "number" },
-        },
-      },
-    };
+    ].schema.items.properties.files = gistBaseFiles;
   }
 
   // see https://developer.github.com/v3/gists/#list-gists-for-a-user
   if (restPattern === "GET /users/:username/gists") {
     operation.responses[200].content[
       "application/json"
-    ].schema.items.properties.files = {
-      type: "object",
-      additionalProperties: {
-        type: "object",
-        properties: {
-          filename: { type: "string" },
-          type: { type: "string" },
-          language: { type: "string" },
-          raw_url: { type: "string" },
-          size: { type: "number" },
-        },
-      },
-    };
+    ].schema.items.properties.files = gistBaseFiles;
+  }
+
+  if (restPattern === "POST /gists/:gist_id/forks") {
+    operation.responses[201].content[
+      "application/json"
+    ].schema.properties.files = gistBaseFiles;
   }
 }
diff --git a/openapi/api.github.com/operations/gists/fork.json b/openapi/api.github.com/operations/gists/fork.json
index 27db4474c6..d2fdc04364 100644
--- a/openapi/api.github.com/operations/gists/fork.json
+++ b/openapi/api.github.com/operations/gists/fork.json
@@ -42,16 +42,14 @@
               "html_url": { "type": "string" },
               "files": {
                 "type": "object",
-                "properties": {
-                  "hello_world.rb": {
-                    "type": "object",
-                    "properties": {
-                      "filename": { "type": "string" },
-                      "type": { "type": "string" },
-                      "language": { "type": "string" },
-                      "raw_url": { "type": "string" },
-                      "size": { "type": "number" }
-                    }
+                "additionalProperties": {
+                  "type": "object",
+                  "properties": {
+                    "filename": { "type": "string" },
+                    "type": { "type": "string" },
+                    "language": { "type": "string" },
+                    "raw_url": { "type": "string" },
+                    "size": { "type": "number" }
                   }
                 }
               },
diff --git a/openapi/api.github.com/operations/gists/update.json b/openapi/api.github.com/operations/gists/update.json
index d9690ed8bb..1571633fed 100644
--- a/openapi/api.github.com/operations/gists/update.json
+++ b/openapi/api.github.com/operations/gists/update.json
@@ -42,54 +42,16 @@
               "html_url": { "type": "string" },
               "files": {
                 "type": "object",
-                "properties": {
-                  "hello_world.rb": {
-                    "type": "object",
-                    "properties": {
-                      "filename": { "type": "string" },
-                      "type": { "type": "string" },
-                      "language": { "type": "string" },
-                      "raw_url": { "type": "string" },
-                      "size": { "type": "number" },
-                      "truncated": { "type": "boolean" },
-                      "content": { "type": "string" }
-                    }
-                  },
-                  "hello_world.py": {
-                    "type": "object",
-                    "properties": {
-                      "filename": { "type": "string" },
-                      "type": { "type": "string" },
-                      "language": { "type": "string" },
-                      "raw_url": { "type": "string" },
-                      "size": { "type": "number" },
-                      "truncated": { "type": "boolean" },
-                      "content": { "type": "string" }
-                    }
-                  },
-                  "hello_world.md": {
-                    "type": "object",
-                    "properties": {
-                      "filename": { "type": "string" },
-                      "type": { "type": "string" },
-                      "language": { "type": "string" },
-                      "raw_url": { "type": "string" },
-                      "size": { "type": "number" },
-                      "truncated": { "type": "boolean" },
-                      "content": { "type": "string" }
-                    }
-                  },
-                  "new_file.txt": {
-                    "type": "object",
-                    "properties": {
-                      "filename": { "type": "string" },
-                      "type": { "type": "string" },
-                      "language": { "type": "string" },
-                      "raw_url": { "type": "string" },
-                      "size": { "type": "number" },
-                      "truncated": { "type": "boolean" },
-                      "content": { "type": "string" }
-                    }
+                "additionalProperties": {
+                  "type": "object",
+                  "properties": {
+                    "filename": { "type": "string" },
+                    "type": { "type": "string" },
+                    "language": { "type": "string" },
+                    "raw_url": { "type": "string" },
+                    "size": { "type": "number" },
+                    "truncated": { "type": "boolean" },
+                    "content": { "type": "string" }
                   }
                 }
               },
diff --git a/openapi/ghe-2.17/operations/gists/fork.json b/openapi/ghe-2.17/operations/gists/fork.json
index 6f4af2460a..281b32dc82 100644
--- a/openapi/ghe-2.17/operations/gists/fork.json
+++ b/openapi/ghe-2.17/operations/gists/fork.json
@@ -42,16 +42,14 @@
               "html_url": { "type": "string" },
               "files": {
                 "type": "object",
-                "properties": {
-                  "hello_world.rb": {
-                    "type": "object",
-                    "properties": {
-                      "filename": { "type": "string" },
-                      "type": { "type": "string" },
-                      "language": { "type": "string" },
-                      "raw_url": { "type": "string" },
-                      "size": { "type": "number" }
-                    }
+                "additionalProperties": {
+                  "type": "object",
+                  "properties": {
+                    "filename": { "type": "string" },
+                    "type": { "type": "string" },
+                    "language": { "type": "string" },
+                    "raw_url": { "type": "string" },
+                    "size": { "type": "number" }
                   }
                 }
               },
diff --git a/openapi/ghe-2.17/operations/gists/update.json b/openapi/ghe-2.17/operations/gists/update.json
index 8f1d6dbcfc..f874e44c75 100644
--- a/openapi/ghe-2.17/operations/gists/update.json
+++ b/openapi/ghe-2.17/operations/gists/update.json
@@ -42,54 +42,16 @@
               "html_url": { "type": "string" },
               "files": {
                 "type": "object",
-                "properties": {
-                  "hello_world.rb": {
-                    "type": "object",
-                    "properties": {
-                      "filename": { "type": "string" },
-                      "type": { "type": "string" },
-                      "language": { "type": "string" },
-                      "raw_url": { "type": "string" },
-                      "size": { "type": "number" },
-                      "truncated": { "type": "boolean" },
-                      "content": { "type": "string" }
-                    }
-                  },
-                  "hello_world.py": {
-                    "type": "object",
-                    "properties": {
-                      "filename": { "type": "string" },
-                      "type": { "type": "string" },
-                      "language": { "type": "string" },
-                      "raw_url": { "type": "string" },
-                      "size": { "type": "number" },
-                      "truncated": { "type": "boolean" },
-                      "content": { "type": "string" }
-                    }
-                  },
-                  "hello_world.md": {
-                    "type": "object",
-                    "properties": {
-                      "filename": { "type": "string" },
-                      "type": { "type": "string" },
-                      "language": { "type": "string" },
-                      "raw_url": { "type": "string" },
-                      "size": { "type": "number" },
-                      "truncated": { "type": "boolean" },
-                      "content": { "type": "string" }
-                    }
-                  },
-                  "new_file.txt": {
-                    "type": "object",
-                    "properties": {
-                      "filename": { "type": "string" },
-                      "type": { "type": "string" },
-                      "language": { "type": "string" },
-                      "raw_url": { "type": "string" },
-                      "size": { "type": "number" },
-                      "truncated": { "type": "boolean" },
-                      "content": { "type": "string" }
-                    }
+                "additionalProperties": {
+                  "type": "object",
+                  "properties": {
+                    "filename": { "type": "string" },
+                    "type": { "type": "string" },
+                    "language": { "type": "string" },
+                    "raw_url": { "type": "string" },
+                    "size": { "type": "number" },
+                    "truncated": { "type": "boolean" },
+                    "content": { "type": "string" }
                   }
                 }
               },
diff --git a/openapi/ghe-2.18/operations/gists/fork.json b/openapi/ghe-2.18/operations/gists/fork.json
index 9fa69b9024..ce9f353769 100644
--- a/openapi/ghe-2.18/operations/gists/fork.json
+++ b/openapi/ghe-2.18/operations/gists/fork.json
@@ -42,16 +42,14 @@
               "html_url": { "type": "string" },
               "files": {
                 "type": "object",
-                "properties": {
-                  "hello_world.rb": {
-                    "type": "object",
-                    "properties": {
-                      "filename": { "type": "string" },
-                      "type": { "type": "string" },
-                      "language": { "type": "string" },
-                      "raw_url": { "type": "string" },
-                      "size": { "type": "number" }
-                    }
+                "additionalProperties": {
+                  "type": "object",
+                  "properties": {
+                    "filename": { "type": "string" },
+                    "type": { "type": "string" },
+                    "language": { "type": "string" },
+                    "raw_url": { "type": "string" },
+                    "size": { "type": "number" }
                   }
                 }
               },
diff --git a/openapi/ghe-2.18/operations/gists/update.json b/openapi/ghe-2.18/operations/gists/update.json
index 5431f0a9e5..5ce261b99e 100644
--- a/openapi/ghe-2.18/operations/gists/update.json
+++ b/openapi/ghe-2.18/operations/gists/update.json
@@ -42,54 +42,16 @@
               "html_url": { "type": "string" },
               "files": {
                 "type": "object",
-                "properties": {
-                  "hello_world.rb": {
-                    "type": "object",
-                    "properties": {
-                      "filename": { "type": "string" },
-                      "type": { "type": "string" },
-                      "language": { "type": "string" },
-                      "raw_url": { "type": "string" },
-                      "size": { "type": "number" },
-                      "truncated": { "type": "boolean" },
-                      "content": { "type": "string" }
-                    }
-                  },
-                  "hello_world.py": {
-                    "type": "object",
-                    "properties": {
-                      "filename": { "type": "string" },
-                      "type": { "type": "string" },
-                      "language": { "type": "string" },
-                      "raw_url": { "type": "string" },
-                      "size": { "type": "number" },
-                      "truncated": { "type": "boolean" },
-                      "content": { "type": "string" }
-                    }
-                  },
-                  "hello_world.md": {
-                    "type": "object",
-                    "properties": {
-                      "filename": { "type": "string" },
-                      "type": { "type": "string" },
-                      "language": { "type": "string" },
-                      "raw_url": { "type": "string" },
-                      "size": { "type": "number" },
-                      "truncated": { "type": "boolean" },
-                      "content": { "type": "string" }
-                    }
-                  },
-                  "new_file.txt": {
-                    "type": "object",
-                    "properties": {
-                      "filename": { "type": "string" },
-                      "type": { "type": "string" },
-                      "language": { "type": "string" },
-                      "raw_url": { "type": "string" },
-                      "size": { "type": "number" },
-                      "truncated": { "type": "boolean" },
-                      "content": { "type": "string" }
-                    }
+                "additionalProperties": {
+                  "type": "object",
+                  "properties": {
+                    "filename": { "type": "string" },
+                    "type": { "type": "string" },
+                    "language": { "type": "string" },
+                    "raw_url": { "type": "string" },
+                    "size": { "type": "number" },
+                    "truncated": { "type": "boolean" },
+                    "content": { "type": "string" }
                   }
                 }
               },
diff --git a/openapi/ghe-2.19/operations/gists/fork.json b/openapi/ghe-2.19/operations/gists/fork.json
index 90b9df1f27..ab38968a27 100644
--- a/openapi/ghe-2.19/operations/gists/fork.json
+++ b/openapi/ghe-2.19/operations/gists/fork.json
@@ -42,16 +42,14 @@
               "html_url": { "type": "string" },
               "files": {
                 "type": "object",
-                "properties": {
-                  "hello_world.rb": {
-                    "type": "object",
-                    "properties": {
-                      "filename": { "type": "string" },
-                      "type": { "type": "string" },
-                      "language": { "type": "string" },
-                      "raw_url": { "type": "string" },
-                      "size": { "type": "number" }
-                    }
+                "additionalProperties": {
+                  "type": "object",
+                  "properties": {
+                    "filename": { "type": "string" },
+                    "type": { "type": "string" },
+                    "language": { "type": "string" },
+                    "raw_url": { "type": "string" },
+                    "size": { "type": "number" }
                   }
                 }
               },
diff --git a/openapi/ghe-2.19/operations/gists/update.json b/openapi/ghe-2.19/operations/gists/update.json
index 8d47acd04e..112b979915 100644
--- a/openapi/ghe-2.19/operations/gists/update.json
+++ b/openapi/ghe-2.19/operations/gists/update.json
@@ -42,54 +42,16 @@
               "html_url": { "type": "string" },
               "files": {
                 "type": "object",
-                "properties": {
-                  "hello_world.rb": {
-                    "type": "object",
-                    "properties": {
-                      "filename": { "type": "string" },
-                      "type": { "type": "string" },
-                      "language": { "type": "string" },
-                      "raw_url": { "type": "string" },
-                      "size": { "type": "number" },
-                      "truncated": { "type": "boolean" },
-                      "content": { "type": "string" }
-                    }
-                  },
-                  "hello_world.py": {
-                    "type": "object",
-                    "properties": {
-                      "filename": { "type": "string" },
-                      "type": { "type": "string" },
-                      "language": { "type": "string" },
-                      "raw_url": { "type": "string" },
-                      "size": { "type": "number" },
-                      "truncated": { "type": "boolean" },
-                      "content": { "type": "string" }
-                    }
-                  },
-                  "hello_world.md": {
-                    "type": "object",
-                    "properties": {
-                      "filename": { "type": "string" },
-                      "type": { "type": "string" },
-                      "language": { "type": "string" },
-                      "raw_url": { "type": "string" },
-                      "size": { "type": "number" },
-                      "truncated": { "type": "boolean" },
-                      "content": { "type": "string" }
-                    }
-                  },
-                  "new_file.txt": {
-                    "type": "object",
-                    "properties": {
-                      "filename": { "type": "string" },
-                      "type": { "type": "string" },
-                      "language": { "type": "string" },
-                      "raw_url": { "type": "string" },
-                      "size": { "type": "number" },
-                      "truncated": { "type": "boolean" },
-                      "content": { "type": "string" }
-                    }
+                "additionalProperties": {
+                  "type": "object",
+                  "properties": {
+                    "filename": { "type": "string" },
+                    "type": { "type": "string" },
+                    "language": { "type": "string" },
+                    "raw_url": { "type": "string" },
+                    "size": { "type": "number" },
+                    "truncated": { "type": "boolean" },
+                    "content": { "type": "string" }
                   }
                 }
               },
diff --git a/openapi/ghe-2.20/operations/gists/fork.json b/openapi/ghe-2.20/operations/gists/fork.json
index 8cdb8c2d26..bc531b3aa9 100644
--- a/openapi/ghe-2.20/operations/gists/fork.json
+++ b/openapi/ghe-2.20/operations/gists/fork.json
@@ -42,16 +42,14 @@
               "html_url": { "type": "string" },
               "files": {
                 "type": "object",
-                "properties": {
-                  "hello_world.rb": {
-                    "type": "object",
-                    "properties": {
-                      "filename": { "type": "string" },
-                      "type": { "type": "string" },
-                      "language": { "type": "string" },
-                      "raw_url": { "type": "string" },
-                      "size": { "type": "number" }
-                    }
+                "additionalProperties": {
+                  "type": "object",
+                  "properties": {
+                    "filename": { "type": "string" },
+                    "type": { "type": "string" },
+                    "language": { "type": "string" },
+                    "raw_url": { "type": "string" },
+                    "size": { "type": "number" }
                   }
                 }
               },
diff --git a/openapi/ghe-2.20/operations/gists/update.json b/openapi/ghe-2.20/operations/gists/update.json
index b3e2dc6f1d..3c779252bd 100644
--- a/openapi/ghe-2.20/operations/gists/update.json
+++ b/openapi/ghe-2.20/operations/gists/update.json
@@ -42,54 +42,16 @@
               "html_url": { "type": "string" },
               "files": {
                 "type": "object",
-                "properties": {
-                  "hello_world.rb": {
-                    "type": "object",
-                    "properties": {
-                      "filename": { "type": "string" },
-                      "type": { "type": "string" },
-                      "language": { "type": "string" },
-                      "raw_url": { "type": "string" },
-                      "size": { "type": "number" },
-                      "truncated": { "type": "boolean" },
-                      "content": { "type": "string" }
-                    }
-                  },
-                  "hello_world.py": {
-                    "type": "object",
-                    "properties": {
-                      "filename": { "type": "string" },
-                      "type": { "type": "string" },
-                      "language": { "type": "string" },
-                      "raw_url": { "type": "string" },
-                      "size": { "type": "number" },
-                      "truncated": { "type": "boolean" },
-                      "content": { "type": "string" }
-                    }
-                  },
-                  "hello_world.md": {
-                    "type": "object",
-                    "properties": {
-                      "filename": { "type": "string" },
-                      "type": { "type": "string" },
-                      "language": { "type": "string" },
-                      "raw_url": { "type": "string" },
-                      "size": { "type": "number" },
-                      "truncated": { "type": "boolean" },
-                      "content": { "type": "string" }
-                    }
-                  },
-                  "new_file.txt": {
-                    "type": "object",
-                    "properties": {
-                      "filename": { "type": "string" },
-                      "type": { "type": "string" },
-                      "language": { "type": "string" },
-                      "raw_url": { "type": "string" },
-                      "size": { "type": "number" },
-                      "truncated": { "type": "boolean" },
-                      "content": { "type": "string" }
-                    }
+                "additionalProperties": {
+                  "type": "object",
+                  "properties": {
+                    "filename": { "type": "string" },
+                    "type": { "type": "string" },
+                    "language": { "type": "string" },
+                    "raw_url": { "type": "string" },
+                    "size": { "type": "number" },
+                    "truncated": { "type": "boolean" },
+                    "content": { "type": "string" }
                   }
                 }
               },