diff --git a/web/templates/admin/add_web.html b/web/templates/admin/add_web.html
index 3bebdd8a..26c98ab5 100644
--- a/web/templates/admin/add_web.html
+++ b/web/templates/admin/add_web.html
@@ -386,6 +386,6 @@
       </div>
 
     <script>
-      GLOBAL.FTP_USER_PREFIX  = <?=json_encode($user)?>;
+      GLOBAL.FTP_USER_PREFIX  = <?=json_encode($user.'_')?>;
       GLOBAL.FTP_USER_PREPATH = <?=json_encode($v_ftp_user_prepath)?>;
     </script>