diff --git a/upload/catalog/view/theme/default/template/extension/payment/squareup.twig b/upload/catalog/view/theme/default/template/extension/payment/squareup.twig
index a8f197ec5..09f7fce80 100644
--- a/upload/catalog/view/theme/default/template/extension/payment/squareup.twig
+++ b/upload/catalog/view/theme/default/template/extension/payment/squareup.twig
@@ -6,7 +6,7 @@
 <div id="squareup-notification">
   <div class="text-center alert alert-info"><i class="fa fa-circle-o-notch fa-spin"></i>&nbsp;{{ text_loading }}</div>
 </div>
-<form class="form-horizontal" action="{{ action }}" method="POST" id="squareup_card_details_form" style="display: none;">
+<form class="form-horizontal" action="{{ action }}" method="post" id="squareup_card_details_form" style="display: none;">
   <fieldset>
     <legend>{{ text_card_details }}</legend>
     {% if cards %}