diff --git a/specification/eventgrid/resource-manager/Microsoft.EventGrid/preview/2018-05-01-preview/EventGrid.json b/specification/eventgrid/resource-manager/Microsoft.EventGrid/preview/2018-05-01-preview/EventGrid.json
index c1c68f524c54..9d3beb881f16 100644
--- a/specification/eventgrid/resource-manager/Microsoft.EventGrid/preview/2018-05-01-preview/EventGrid.json
+++ b/specification/eventgrid/resource-manager/Microsoft.EventGrid/preview/2018-05-01-preview/EventGrid.json
@@ -1532,7 +1532,8 @@
                     "x-ms-enum": {
                         "name": "EventDeliverySchema",
                         "modelAsString": true
-                    }
+                    },
+                    "default": "EventGridSchema"
                 },
                 "retryPolicy": {
                     "$ref": "#/definitions/RetryPolicy",
@@ -1847,7 +1848,8 @@
                     "x-ms-enum": {
                         "name": "EventDeliverySchema",
                         "modelAsString": true
-                    }
+                    },
+                    "default": "EventGridSchema"
                 },
                 "retryPolicy": {
                     "$ref": "#/definitions/RetryPolicy",
@@ -1977,7 +1979,8 @@
                     "x-ms-enum": {
                         "name": "InputSchema",
                         "modelAsString": true
-                    }
+                    },
+                    "default": "EventGridSchema"
                 },
                 "inputSchemaMapping": {
                     "$ref": "#/definitions/InputSchemaMapping",
@@ -2101,7 +2104,8 @@
                         "type": "string"
                     }
                 }
-            }
+            },
+            "x-ms-azure-resource": true
         },
         "Topic": {
             "description": "EventGrid Topic",