diff --git a/assets/js/src/public.jsx b/assets/js/src/public.jsx
index 8f9cf420e5..ef9c785963 100644
--- a/assets/js/src/public.jsx
+++ b/assets/js/src/public.jsx
@@ -22,7 +22,7 @@ jQuery(($) => {
    * @param form jQuery object of form form.mailpoet_form
    */
   function checkFormContainer(form) {
-    if (form.width() < 500) {
+    if (form.width() < 400) {
       form.addClass('mailpoet_form_tight_container');
     } else {
       form.removeClass('mailpoet_form_tight_container');