diff --git a/chrome/content/zotero/advancedSearch.js b/chrome/content/zotero/advancedSearch.js
index a6e22c08f2..dd9eb17301 100644
--- a/chrome/content/zotero/advancedSearch.js
+++ b/chrome/content/zotero/advancedSearch.js
@@ -24,6 +24,8 @@
 */
 
 
+Components.utils.import("resource://gre/modules/Services.jsm");
+
 var ZoteroAdvancedSearch = new function() {
 	this.onLoad = onLoad;
 	this.search = search;