diff --git a/phpgwapi/inc/class.categories.inc.php b/phpgwapi/inc/class.categories.inc.php
index 01c3654f51..ccb31f681b 100644
--- a/phpgwapi/inc/class.categories.inc.php
+++ b/phpgwapi/inc/class.categories.inc.php
@@ -161,7 +161,7 @@
 				$sort = 'ASC';
 			}
 
-			if (!empty($order) && preg_match('/^[a-zA-Z_, ]+$/',$order) && (empty($sort) || preg_match('/^(ASC|DESC|asc|desc)$/')))
+			if (!empty($order) && preg_match('/^[a-zA-Z_, ]+$/',$order) && (empty($sort) || preg_match('/^(ASC|DESC|asc|desc)$/',$sort)))
 			{
 				$ordermethod = " ORDER BY $order $sort";
 			}