WooCommerce - Hide coupon field on checkout

<?php
  // WooCommerce hide coupon field on checkout
  // code goes in functions.php for your child theme
  add_filter( ‘woocommerce_coupons_enabled’, ‘hide_coupon_field_on_checkout’ );
  function hide_coupon_field_on_checkout( $enabled ) {
    if ( is_checkout() ) {
      $enabled = false;
    }
    return $enabled;
  }