diff --git a/multi-file/openapi.yaml b/multi-file/openapi.yaml
index dedd603..fa13cc6 100644
--- a/multi-file/openapi.yaml
+++ b/multi-file/openapi.yaml
@@ -21,7 +21,7 @@ paths:
       parameters:
         - name: petId
           in: path
-          required: true
+          required: false
           schema:
             type: integer
       responses: