diff --git a/addons/website_event/static/src/js/website_event.js b/addons/website_event/static/src/js/website_event.js
index 81192b03e0f..1db875927b7 100644
--- a/addons/website_event/static/src/js/website_event.js
+++ b/addons/website_event/static/src/js/website_event.js
@@ -35,12 +35,16 @@ var EventRegistrationForm = Widget.extend({
                 return;
             }
             var $modal = $(modal);
+            $modal.modal({backdrop: 'static', keyboard: false});
             $modal.find('.modal-body > div').removeClass('container'); // retrocompatibility - REMOVE ME in master / saas-19
             $modal.insertAfter($form).modal();
             $modal.on('click', '.js_goto_event', function () {
                 $modal.modal('hide');
                 $button.prop('disabled', false);
             });
+            $modal.on('click', '.close', function () {
+                $button.prop('disabled', false);
+            });
         });
     },
 });