diff --git a/lib/generate-browserconfig-from-configuration.js b/lib/generate-browserconfig-from-configuration.js
index 06fa2437..4e2d4cbd 100644
--- a/lib/generate-browserconfig-from-configuration.js
+++ b/lib/generate-browserconfig-from-configuration.js
@@ -4,7 +4,6 @@ module.exports = generateBrowserconfigFromConfiguration;
 
 const xmlbuilder = require('xmlbuilder');
 const hasTarget = require('./has-target');
-const includes = require('./utils/includes');
 
 const ALLOWED_ICON_ELEMENTS = [
   'square70x70logo',
@@ -40,7 +39,7 @@ function constructTile(icons, color) {
   const tile = {};
 
   icons.forEach(function(icon) {
-    if (!includes(ALLOWED_ICON_ELEMENTS, icon.element)) {
+    if (!ALLOWED_ICON_ELEMENTS.includes(icon.element)) {
       throw new Error(`The 'element' property of the icon for browserconfig.xml must be one of ${ALLOWED_ICON_ELEMENTS.join(', ')}`);
     }
 
diff --git a/lib/utils/includes.js b/lib/utils/includes.js
deleted file mode 100644
index 2184b499..00000000
--- a/lib/utils/includes.js
+++ /dev/null
@@ -1,20 +0,0 @@
-'use strict';
-
-module.exports = includes;
-
-// Polyfill for Array.prototype.includes for Node.js < 6
-function includes(array, element) {
-  if (!array) {
-    return false;
-  }
-
-  const length = array.length;
-
-  for (let i = 0; i < length; i++) {
-    if (array[i] === element) {
-      return true;
-    }
-  }
-
-  return false;
-}
diff --git a/node-tests/unit/utils/includes-test.js b/node-tests/unit/utils/includes-test.js
deleted file mode 100644
index b41f23be..00000000
--- a/node-tests/unit/utils/includes-test.js
+++ /dev/null
@@ -1,18 +0,0 @@
-'use strict';
-
-const assert = require('assert');
-const includes = require('../../../lib/utils/includes');
-
-describe('Unit: includes()', function() {
-  it('returns false if the array is null', function() {
-    assert.ok(!includes(null, 1));
-  });
-
-  it('returns true if the array contains the element', function() {
-    assert.ok(includes([1, 2], 1));
-  });
-
-  it('returns false if the array does not contain the element', function() {
-    assert.ok(!includes([1, 2], 3));
-  });
-});