diff --git a/chrome/content/zotero/xpcom/id.js b/chrome/content/zotero/xpcom/id.js
index 17c85a8ac..c444dc2a7 100644
--- a/chrome/content/zotero/xpcom/id.js
+++ b/chrome/content/zotero/xpcom/id.js
@@ -93,7 +93,7 @@ Zotero.ID_Tracker = function () {
 	}
 	
 	
-	this.isValidKey = function () {
+	this.isValidKey = function (value) {
 		var re = /^[23456789ABCDEFGHIJKLMNPQRSTUVWXYZ]{8}$/
 		return re.test(value);
 	}