diff --git a/addons/sale/static/src/js/variant_mixin.js b/addons/sale/static/src/js/variant_mixin.js
index 907ebf603c8..219cd1ea817 100644
--- a/addons/sale/static/src/js/variant_mixin.js
+++ b/addons/sale/static/src/js/variant_mixin.js
@@ -403,7 +403,6 @@ var VariantMixin = {
                 );
             });
         });
-        $parent.find("#buy_now").toggleClass('disabled', disable);
     },
     /**
      * Extracted to a method to be extendable by other modules
diff --git a/addons/website_sale/static/src/js/website_sale.js b/addons/website_sale/static/src/js/website_sale.js
index f257454e0f8..c4888233e93 100644
--- a/addons/website_sale/static/src/js/website_sale.js
+++ b/addons/website_sale/static/src/js/website_sale.js
@@ -698,6 +698,7 @@ publicWidget.registry.WebsiteSale = publicWidget.Widget.extend(VariantMixin, {
     _toggleDisable: function ($parent, isCombinationPossible) {
         VariantMixin._toggleDisable.apply(this, arguments);
         $parent.find("#add_to_cart").toggleClass('disabled', !isCombinationPossible);
+        $parent.find("#buy_now").toggleClass('disabled', !isCombinationPossible);
     },
     /**
      * Write the properties of the form elements in the DOM to prevent the