diff --git a/modules/utils.js b/modules/utils.js
index 927e7702..4ad35514 100644
--- a/modules/utils.js
+++ b/modules/utils.js
@@ -14,7 +14,7 @@
  * The Original Code is the Tree Style Tab.
  *
  * The Initial Developer of the Original Code is YUKI "Piro" Hiroshi.
- * Portions created by the Initial Developer are Copyright (C) 2010-2012
+ * Portions created by the Initial Developer are Copyright (C) 2010-2013
  * the Initial Developer. All Rights Reserved.
  *
  * Contributor(s): YUKI "Piro" Hiroshi <piro.outsider.reflex@gmail.com>
@@ -121,7 +121,7 @@ let TreeStyleTabUtils = {
 							base.kDROPLINK_LOAD
 					);
 					this.clearTreePref('loadDroppedLinkToNewChildTab.confirm');
-					utithisls.clearTreePref('loadDroppedLinkToNewChildTab');
+					this.clearTreePref('loadDroppedLinkToNewChildTab');
 				}
 				if (this.getTreePref('openGroupBookmarkAsTabSubTree') !== null) {
 					let behavior = 0;