diff --git a/data/api/client-server/key_backup.yaml b/data/api/client-server/key_backup.yaml
index fb2766805..3df6d2640 100644
--- a/data/api/client-server/key_backup.yaml
+++ b/data/api/client-server/key_backup.yaml
@@ -718,7 +718,6 @@ paths:
           content:
             application/json:
               schema:
-                type: object
                 $ref: definitions/room_key_backup.yaml
         "404":
           description: The backup was not found.