diff --git a/src/AjaxUploader.jsx b/src/AjaxUploader.jsx
index 248e3e15..eab7a5bc 100644
--- a/src/AjaxUploader.jsx
+++ b/src/AjaxUploader.jsx
@@ -159,7 +159,7 @@ class AjaxUploader extends Component {
           },
         };
         this.reqs[uid] = request(requestOption);
-        onStart(file);
+        onStart(transformedFile);
       });
     });
   }