diff --git a/js/lib/upload.js b/js/lib/upload.js
index f102c851..4a300b32 100644
--- a/js/lib/upload.js
+++ b/js/lib/upload.js
@@ -70,7 +70,7 @@ class MockUploader {
   }
 
   async upload(file, objectName) {
-    return Promise.resolve({})
+    return Promise.resolve({ ok: true })
   }
 }