diff --git a/lib/Doctrine/ORM/Mapping/Driver/XmlDriver.php b/lib/Doctrine/ORM/Mapping/Driver/XmlDriver.php
index 21e97c153..2797fb126 100644
--- a/lib/Doctrine/ORM/Mapping/Driver/XmlDriver.php
+++ b/lib/Doctrine/ORM/Mapping/Driver/XmlDriver.php
@@ -790,7 +790,7 @@ class XmlDriver extends FileDriver
      *
      * @return array The list of cascade options.
      */
-    private function _getCascadeMappings($cascadeElement)
+    private function _getCascadeMappings(SimpleXMLElement $cascadeElement)
     {
         $cascades = array();
         /* @var $action SimpleXmlElement */