diff --git a/core/trunk/core/tests/class/DataObjectController.php b/core/trunk/core/tests/class/DataObjectController.php
index 9eb6da4c97540fae63f5afeee0b2994d30d9d2e7..3317f1f82b39caeac4253e0fe9a570247422e361 100644
--- a/core/trunk/core/tests/class/DataObjectController.php
+++ b/core/trunk/core/tests/class/DataObjectController.php
@@ -606,7 +606,7 @@ class dataObjectController extends DOMDocument
     
     public function getXmlString($dataObject)
     {
-        $XmlDocument = $this->asXmlDocument();
+        $XmlDocument = $this->asXmlDocument($dataObject);
         $XmlString = $XmlDocument->saveXML();
         $XmlPrettyString = $this->formatXmlString($XmlString);
         return $XmlPrettyString;