diff --git a/application/controllers/ApprovalchainmanagerController.php b/application/controllers/ApprovalchainmanagerController.php
index dcb342c24332c08aace74d7b83731ec2e459d914..6a9e895bc9072a3c0706859602daaefc286a15f1 100644
--- a/application/controllers/ApprovalchainmanagerController.php
+++ b/application/controllers/ApprovalchainmanagerController.php
@@ -279,7 +279,7 @@ class ApprovalChainManagerController extends Nmc_Controller_Action
         $xhtml = $out->render($template);
         $dom = new DOMDocument();
         $dom->loadHTML($xhtml);
-        $dom->childNodes->item(1)->setAttribute('xmlns', 'http://www.w3.org/1999/xhtml');
+        $dom->childNodes->item(1)->data .= 'xmlns="http://www.w3.org/1999/xhtml"';
         header('Content-type: application/xhtml+xml');
         echo $dom->saveXML();
     }