--- a/layout/tools/reftest/bootstrap.js
+++ b/layout/tools/reftest/bootstrap.js
@@ -1,15 +1,14 @@
 /* This Source Code Form is subject to the terms of the Mozilla Public
  * 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/. */
 
 const Cm = Components.manager;
 
-ChromeUtils.import("resource://gre/modules/FileUtils.jsm");
 ChromeUtils.import("resource://gre/modules/Services.jsm");
 
 function processTerminated() {
   return new Promise(resolve => {
     Services.obs.addObserver(function observe(subject, topic) {
       if (topic == "ipc:content-shutdown") {
         Services.obs.removeObserver(observe, topic);
         resolve();