diff --git a/phpgwapi/inc/class.xmlrpcresp.inc.php b/phpgwapi/inc/class.xmlrpcresp.inc.php
index b9f9baa20f..c12b7d15e5 100644
--- a/phpgwapi/inc/class.xmlrpcresp.inc.php
+++ b/phpgwapi/inc/class.xmlrpcresp.inc.php
@@ -22,7 +22,7 @@
 	{
 		var $xv = array();
 		var $fn;
-		var $fs;
+		var $fs = '';
 		var $hdrs;
 
 		function xmlrpcresp($val='', $fcode=0, $fstr='')