diff --git a/Octokit.Tests/Clients/GitHubAppsClientTests.cs b/Octokit.Tests/Clients/GitHubAppsClientTests.cs
index 201a32de3d..e96166d48f 100644
--- a/Octokit.Tests/Clients/GitHubAppsClientTests.cs
+++ b/Octokit.Tests/Clients/GitHubAppsClientTests.cs
@@ -98,7 +98,7 @@ public void PostsToCorrectUrl()
 
                 client.CreateInstallationToken(fakeInstallationId);
 
-                connection.Received().Post<AccessToken>(Arg.Is<Uri>(u => u.ToString() == "installations/3141/access_tokens"), string.Empty, "application/vnd.github.machine-man-preview+json");
+                connection.Received().Post<AccessToken>(Arg.Is<Uri>(u => u.ToString() == "app/installations/3141/access_tokens"), string.Empty, "application/vnd.github.machine-man-preview+json");
             }
         }
     }
diff --git a/Octokit/Helpers/ApiUrls.cs b/Octokit/Helpers/ApiUrls.cs
index c7c8d3179b..9fe5dd7c15 100644
--- a/Octokit/Helpers/ApiUrls.cs
+++ b/Octokit/Helpers/ApiUrls.cs
@@ -287,7 +287,7 @@ public static Uri NotificationSubscription(int id)
         /// <param name="installationId">The Id of the GitHub App installation.</param>
         public static Uri AccessTokens(long installationId)
         {
-            return "installations/{0}/access_tokens".FormatUri(installationId);
+            return "app/installations/{0}/access_tokens".FormatUri(installationId);
         }
 
         /// <summary>