diff --git a/multi-file/openapi.yaml b/multi-file/openapi.yaml
index dedd603..e5e1adb 100644
--- a/multi-file/openapi.yaml
+++ b/multi-file/openapi.yaml
@@ -23,7 +23,7 @@ paths:
           in: path
           required: true
           schema:
-            type: integer
+            type: string
       responses:
         "200":
           description: A single pet