diff --git a/templates/checkout/_partials/cart-voucher.tpl b/templates/checkout/_partials/cart-voucher.tpl
index 7a0eb10..f2b1e32 100644
--- a/templates/checkout/_partials/cart-voucher.tpl
+++ b/templates/checkout/_partials/cart-voucher.tpl
@@ -54,7 +54,7 @@
         <div id="promo-code mt-8">
           <div class="promo-code">
             {block name='cart_voucher_form'}
-              <form action="{$urls.pages.cart}" data-link-action="add-voucher" method="post">
+              <form id="promo-code-form" action="{$urls.pages.cart}" data-link-action="add-voucher" method="post">
                 <input type="hidden" name="token" value="{$static_token}">
                 <input type="hidden" name="addDiscount" value="1">
                 <input class="promo-input" type="text" name="discount_name" placeholder="{l s='Promo code' d='Shop.Theme.Checkout'}">