diff --git a/chrome/content/zotero/reportInterface.js b/chrome/content/zotero/reportInterface.js
index abf4d969e..7621078e9 100644
--- a/chrome/content/zotero/reportInterface.js
+++ b/chrome/content/zotero/reportInterface.js
@@ -21,7 +21,7 @@
 */
 
 
-Zotero_Report_Interface = new function() {
+var Zotero_Report_Interface = new function() {
 	this.loadCollectionReport = loadCollectionReport;
 	this.loadItemReport = loadItemReport;
 	this.loadItemReportByIds = loadItemReportByIds;