diff --git a/lib/__tests__/fs-integration.test.js b/lib/__tests__/fs-integration.test.js
index efd7ba90..4d65d699 100644
--- a/lib/__tests__/fs-integration.test.js
+++ b/lib/__tests__/fs-integration.test.js
@@ -1,31 +1,33 @@
-var assert = require('assert')
-var path = require('path')
-var os = require('os')
-var fs = require('fs')
-var fse = require('../')
+'use strict'
+
+const os = require('os')
+const fs = require('fs')
+const fse = require('../')
+const path = require('path')
+const assert = require('assert')
 
 /* global afterEach, beforeEach, describe, it */
 
-describe('native fs', function () {
+describe('native fs', () => {
   var TEST_DIR
 
-  beforeEach(function (done) {
+  beforeEach(done => {
     TEST_DIR = path.join(os.tmpdir(), 'fs-extra', 'native-fs')
     fse.emptyDir(TEST_DIR, done)
   })
 
-  afterEach(function (done) {
+  afterEach(done => {
     fse.remove(TEST_DIR, done)
   })
 
-  it('should use native fs methods', function () {
+  it('should use native fs methods', () => {
     var file = path.join(TEST_DIR, 'write.txt')
     fse.writeFileSync(file, 'hello')
     var data = fse.readFileSync(file, 'utf8')
     assert.equal(data, 'hello')
   })
 
-  it('should have native fs constants', function () {
+  it('should have native fs constants', () => {
     // Node.js v0.12 / IO.js
     if ('F_OK' in fs) {
       assert.equal(fse.F_OK, fs.F_OK)