diff --git a/test/spec/MockFileSystemImpl.js b/test/spec/MockFileSystemImpl.js
index df1ef34300f..98118e7ced0 100644
--- a/test/spec/MockFileSystemImpl.js
+++ b/test/spec/MockFileSystemImpl.js
@@ -188,14 +188,14 @@ define(function (require, exports, module) {
         _offlineCallback = offlineCallback;
     }
 
-    function watchPath(path, callback) {
+    function watchPath(path, ignored, callback) {
         var cb = _getCallback("watchPath", path, callback);
 
         _model.watchPath(path);
         cb(null);
     }
 
-    function unwatchPath(path, callback) {
+    function unwatchPath(path, ignored, callback) {
         var cb = _getCallback("unwatchPath", path, callback);
         _model.unwatchPath(path);
         cb(null);