--- a/includes/template.php	Wed Jul 29 10:48:43 2009 -0400
+++ b/includes/template.php	Wed Jul 29 11:48:54 2009 -0400
@@ -1771,7 +1771,7 @@
         $params = false;
       $escape = !empty($escape);
       
-      $result = makeUrlNS($namespace, $page_id, $params, $escape);
+      $result = makeUrlNS($namespace, sanitize_page_id($page_id), $params, $escape);
       
       if ( !$post_eval )
       {