diff --git a/include/functions_rate.inc.php b/include/functions_rate.inc.php
index 4d7f756b7..181624d3e 100644
--- a/include/functions_rate.inc.php
+++ b/include/functions_rate.inc.php
@@ -116,7 +116,7 @@ DELETE
   WHERE element_id = '.$image_id.'
   AND user_id = '.$user['id'].'
 ';
-  if (isset($user_anonymous))
+  if ($user_anonymous)
   {
     $query.= ' AND anonymous_id = \''.$anonymous_id.'\'';
   }