diff --git a/learningapi.yaml b/learningapi.yaml
index 8cc9e0b..18f9004 100644
--- a/learningapi.yaml
+++ b/learningapi.yaml
@@ -37,7 +37,7 @@ paths:
             application/json:
               example: This is a demo API.
         '400':
-          $ref: '#/components/responses/badRequest'
+          $ref: '#/components/responses/badRequest829370991c'
   /activities:
     post:
       tags: