diff --git a/code/model/UserDefinedForm.php b/code/model/UserDefinedForm.php
index 94ad55e..6e4665e 100755
--- a/code/model/UserDefinedForm.php
+++ b/code/model/UserDefinedForm.php
@@ -838,7 +838,7 @@ JS
      * @param ArrayList fields
      * @return ArrayData
      */
-    private function getMergeFieldsMap($fields = array())
+    protected function getMergeFieldsMap($fields = array())
     {
         $data = new ArrayData(array());