diff --git a/library/ajax/manage_admin.php b/library/ajax/manage_admin.php
index 90467fd18..ee5d380f1 100644
--- a/library/ajax/manage_admin.php
+++ b/library/ajax/manage_admin.php
@@ -42,7 +42,7 @@ switch ($mode) {
 
         global $template;
 
-        $match = 'tpl_';
+        $match = XS_TPL_PREFIX;
         $match_len = strlen($match);
         $dir = $template->cachedir;
         $res = @opendir($dir);