diff --git a/chrome/content/zotero/xpcom/data/collection.js b/chrome/content/zotero/xpcom/data/collection.js
index 264c308427..b95017cbc6 100644
--- a/chrome/content/zotero/xpcom/data/collection.js
+++ b/chrome/content/zotero/xpcom/data/collection.js
@@ -404,7 +404,7 @@ Zotero.Collection.prototype.save = function () {
 			}
 			
 			if (this.id && this.hasDescendent('collection', newParent.id)) {
-				throw ('Cannot move collection into one of its own descendents!', 2);
+				throw ('Cannot move collection into one of its own descendents!');
 			}
 			
 			var parent = newParent.id;