diff --git a/include/ajax.forms.php b/include/ajax.forms.php
index e53b91348a4d47b3a0b0bc44b001051f292f22d4..ca33e246c64c973b69106a4ef63b43232aa60e33 100644
--- a/include/ajax.forms.php
+++ b/include/ajax.forms.php
@@ -113,7 +113,7 @@ class DynamicFormsAjaxAPI extends AjaxController {
     function attach() {
         $field = new FileUploadField();
         return JsonDataEncoder::encode(
-            array('id'=>$field->ajaxUpload(true))
+            array('id'=>$field->ajaxUpload())
         );
     }
 }