diff --git a/interface/web/mail/mail_user_filter_edit.php b/interface/web/mail/mail_user_filter_edit.php
index a16d3d12a097e4c2f8e259254df2afd57fa95927..4d003ce4e1b5eca8e0a2cc3d387f5e9a053daa5c 100644
--- a/interface/web/mail/mail_user_filter_edit.php
+++ b/interface/web/mail/mail_user_filter_edit.php
@@ -73,7 +73,7 @@ class page_action extends tform_actions {
 		$app->db->datalogUpdate('mail_user', "custom_mailfilter = '$rule_content'", 'mailuser_id', $this->dataRecord["mailuser_id"]);
 		
 		// set permissions
-		$app->db->query("UPDATE mail_user_filter SET sys_groupid = ".$mailuser['sys_groupid']." WHERE filter_id = "$this->id);
+		$app->db->query("UPDATE mail_user_filter SET sys_groupid = ".$mailuser['sys_groupid']." WHERE filter_id = ".$this->id);
 	
 	}