diff --git a/Gruntfile.js b/Gruntfile.js
index 35ee220bde..bf587bfdd5 100644
--- a/Gruntfile.js
+++ b/Gruntfile.js
@@ -1,7 +1,7 @@
 /* jshint node:true */
 /* globals Set */
 var webpackConfig = require( './webpack.config' );
-const { execSync } = require( 'child_process' );
+var execSync = require( 'child_process' ).execSync;
 
 module.exports = function(grunt) {
 	var path = require('path'),
@@ -12,7 +12,7 @@ module.exports = function(grunt) {
  		BANNER_TEXT = '/*! This file is auto-generated */',
 		autoprefixer = require( 'autoprefixer' );
 
-	const packageJson = grunt.file.readJSON( 'package.json' );
+	var packageJson = grunt.file.readJSON( 'package.json' );
 
 	// Load tasks.
 	require('matchdep').filterDev(['grunt-*', '!grunt-legacy-util']).forEach( grunt.loadNpmTasks );
@@ -788,18 +788,18 @@ module.exports = function(grunt) {
 	] );
 
 	grunt.registerTask( 'download-packages', function() {
-		const directory = 'packages';
-		const version = packageJson.wordpress.packagesVersion;
+		var directory = 'packages';
+		var version = packageJson.wordpress.packagesVersion;
 
 		if ( ! grunt.file.exists( directory  ) ) {
 			// Clone gutenberg
-			execSync( `git clone https://github.com/WordPress/gutenberg.git ${ directory }`, { stdio: 'inherit' } );
+			execSync( 'git clone https://github.com/WordPress/gutenberg.git ' + directory, { stdio: 'inherit' } );
 		}
 
 		execSync( 'git fetch --tags', { cwd: directory, stdio: 'inherit' } );
 
 		// Make sure we are on the correct version of Gutenberg.
-		execSync( `git reset --hard ${ version }`, { cwd: directory, stdio: 'inherit' } );
+		execSync( 'git reset --hard ' + version, { cwd: directory, stdio: 'inherit' } );
 
 		// Install Gutenberg dependencies and build the packages.
 		execSync( 'npm install', { cwd: directory, stdio: 'inherit' } );