diff --git a/phpgwapi/inc/class.groupdav.inc.php b/phpgwapi/inc/class.groupdav.inc.php
index d7227bbc14..17b574b052 100644
--- a/phpgwapi/inc/class.groupdav.inc.php
+++ b/phpgwapi/inc/class.groupdav.inc.php
@@ -1681,7 +1681,7 @@ class groupdav extends HTTP_WebDAV_Server
 	 */
 	public function log($str)
 	{
-		$to_log[] = $str;
+		$this->to_log[] = $str;
 
 		error_log($str);
 	}