diff --git a/public_html/includes/templates/default.catalog/views/box_checkout_customer.inc.php b/public_html/includes/templates/default.catalog/views/box_checkout_customer.inc.php
index 1964c7306..7eaa344a8 100644
--- a/public_html/includes/templates/default.catalog/views/box_checkout_customer.inc.php
+++ b/public_html/includes/templates/default.catalog/views/box_checkout_customer.inc.php
@@ -3,7 +3,7 @@
 
   <?php if (empty(customer::$data['id'])) { ?>
   <div style="float:right">
-    <a href="<?php echo document::ilink('login', array('redirect_url' => document::ilink('checkout'))) ?>" data-toggle="lightbox"><?php echo language::translate('title_sign_in', 'Sign In'); ?></a>
+    <a href="<?php echo document::ilink('login', array('redirect_url' => document::ilink('checkout'))) ?>" data-toggle="lightbox" data-require-window-width="768"><?php echo language::translate('title_sign_in', 'Sign In'); ?></a>
   </div>
   <?php } ?>