diff --git a/web_confirm_window_close/static/src/js/web_confirm_window_close.js b/web_confirm_window_close/static/src/js/web_confirm_window_close.js
index 3aba9f97..61594274 100644
--- a/web_confirm_window_close/static/src/js/web_confirm_window_close.js
+++ b/web_confirm_window_close/static/src/js/web_confirm_window_close.js
@@ -10,6 +10,7 @@ odoo.define('web_confirm_window_close', function (require) {
             if ($('html').find('.oe_form_dirty').length) {
                 e.preventDefault();
             }
+            return 'Your have unsaved data. Are you sure you want to close window?';
         },
 
         start: function() {