diff --git a/www/pad/inner.js b/www/pad/inner.js
index 18cccfc6b..9b56e56bb 100644
--- a/www/pad/inner.js
+++ b/www/pad/inner.js
@@ -452,8 +452,8 @@ define([
         var $iframe = $('html').find('iframe').contents();
         var ifrWindow = $html.find('iframe')[0].contentWindow;
 
-        var customCss = '/customize/ckeditor-contents.css?' + CKEDITOR.CRYPTPAD_URLARGS;
-        $iframe.find('head').append('<link href="' + customCss + '" type="text/css" rel="stylesheet" _fcktemp="true"/>')
+        var customCss = '/customize/ckeditor-contents.css?' + window.CKEDITOR.CRYPTPAD_URLARGS;
+        $iframe.find('head').append('<link href="' + customCss + '" type="text/css" rel="stylesheet" _fcktemp="true"/>');
 
         framework._.sfCommon.addShortcuts(ifrWindow);