diff --git a/chrome/content/zotero/customElements.js b/chrome/content/zotero/customElements.js
index 42fd5161b3..25baa48c82 100644
--- a/chrome/content/zotero/customElements.js
+++ b/chrome/content/zotero/customElements.js
@@ -25,6 +25,8 @@
 
 'use strict';
 
+Services.scriptloader.loadSubScript("resource://zotero/require.js", this);
+
 Services.scriptloader.loadSubScript("chrome://global/content/customElements.js", this);
 Services.scriptloader.loadSubScript("chrome://zotero/content/elements/base.js", this);