--- a/testing/marionette/message.js
+++ b/testing/marionette/message.js
@@ -2,17 +2,16 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this file,
  * You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 "use strict";
 
 var {utils: Cu} = Components;
 
 Cu.import("resource://gre/modules/Log.jsm");
-Cu.import("resource://gre/modules/Task.jsm");
 
 Cu.import("chrome://marionette/content/assert.js");
 Cu.import("chrome://marionette/content/error.js");
 
 this.EXPORTED_SYMBOLS = [
   "Command",
   "Message",
   "MessageOrigin",