diff --git a/specification/web/resource-manager/Microsoft.Web/stable/2021-03-01/WebApps.json b/specification/web/resource-manager/Microsoft.Web/stable/2021-03-01/WebApps.json
index 9dc821e1edc1..f9c4bb4c9859 100644
--- a/specification/web/resource-manager/Microsoft.Web/stable/2021-03-01/WebApps.json
+++ b/specification/web/resource-manager/Microsoft.Web/stable/2021-03-01/WebApps.json
@@ -8117,7 +8117,8 @@
               "$ref": "./CommonDefinitions.json#/definitions/DefaultErrorResponse"
             }
           }
-        }
+        },
+        "x-ms-long-running-operation": true
       }
     },
     "/subscriptions/{subscriptionId}/resourceGroups/{resourceGroupName}/providers/Microsoft.Web/sites/{name}/restoreFromBackupBlob": {
@@ -17376,7 +17377,8 @@
               "$ref": "./CommonDefinitions.json#/definitions/DefaultErrorResponse"
             }
           }
-        }
+        },
+        "x-ms-long-running-operation": true
       }
     },
     "/subscriptions/{subscriptionId}/resourceGroups/{resourceGroupName}/providers/Microsoft.Web/sites/{name}/slots/{slot}/restoreFromBackupBlob": {