diff --git a/templates/2k11/config.inc.php b/templates/2k11/config.inc.php
index 74b003c3..f3af1923 100644
--- a/templates/2k11/config.inc.php
+++ b/templates/2k11/config.inc.php
@@ -114,6 +114,7 @@ function serendipity_plugin_api_pre_event_hook($event, &$bag, &$eventData, &$add
         case 'external_plugin':
             switch ($eventData) {
                 case 'admin/serendipity_editor.js':
+                    header('Content-Type: application/javascript');
                     $data = array('token_url' => serendipity_setFormToken("url"));
                     echo serendipity_smarty_show('admin/serendipity_editor.js.tpl', $data);
                 break;