diff --git a/addons/website_sale/static/src/js/website_sale.js b/addons/website_sale/static/src/js/website_sale.js
index 743c7e2a24c..3ecbcde4308 100644
--- a/addons/website_sale/static/src/js/website_sale.js
+++ b/addons/website_sale/static/src/js/website_sale.js
@@ -123,11 +123,15 @@ $('.oe_website_sale').each(function () {
         ev.preventDefault();
         var $link = $(ev.currentTarget);
         var $input = $link.parent().find("input");
+        var product_id = +$input.closest('div:has(input[name="product_id"])').find('input[name="product_id"]').val();
         var min = parseFloat($input.data("min") || 0);
         var max = parseFloat($input.data("max") || Infinity);
         var quantity = ($link.has(".fa-minus").length ? -1 : 1) + parseFloat($input.val(),10);
-        $input.val(quantity > min ? (quantity < max ? quantity : max) : min);
-        $('input[name="'+$input.attr("name")+'"]').val(quantity > min ? (quantity < max ? quantity : max) : min);
+        // if they are more of one input for this product (eg: option modal)
+        $('input[name="'+$input.attr("name")+'"]').add($input).filter(function () {
+            var $prod = $(this).closest('*:has(input[name="product_id"])');
+            return !$prod.length || +$prod.find('input[name="product_id"]').val() === product_id;
+        }).val(quantity > min ? (quantity < max ? quantity : max) : min);
         $input.change();
         return false;
     });