diff --git a/include/ajax.forms.php b/include/ajax.forms.php
index 1d4dc14236ad922978c8cefd7e8020bc1a6d14da..f99870a9770d436cc36c028c068a5d25ba9061d9 100644
--- a/include/ajax.forms.php
+++ b/include/ajax.forms.php
@@ -358,7 +358,7 @@ class DynamicFormsAjaxAPI extends AjaxController {
     function attach() {
         $field = new FileUploadField();
         return JsonDataEncoder::encode(
-            array('id'=>$field->ajaxUpload(true))
+            array('id'=>$field->ajaxUpload())
         );
     }