diff --git a/static/yaml/zulip.yaml b/static/yaml/zulip.yaml
index 9c0e904979..4244ff47e3 100644
--- a/static/yaml/zulip.yaml
+++ b/static/yaml/zulip.yaml
@@ -414,18 +414,17 @@ paths:
         '400':
           description: Bad request.
           schema:
-            $ref: '#/definitions/JsonError'
-            properties:
-              msg:
-                type: string
-                enum:
-                - Your organization has turned off message editing
-                - You don't have permission to edit this message
-                - The time limit for editing this message has past
-                - Nothing to change
-                - Topic can't be empty
-              result:
-                type: string
+            allOf:
+            - $ref: '#/definitions/JsonError'
+            - properties:
+                msg:
+                  type: string
+                  enum:
+                  - Your organization has turned off message editing
+                  - You don't have permission to edit this message
+                  - The time limit for editing this message has past
+                  - Nothing to change
+                  - Topic can't be empty
 
   /streams:
     get: