diff --git a/app/assets/javascripts/discourse/views/invite-reply-button.js.es6 b/app/assets/javascripts/discourse/views/invite-reply-button.js.es6
index 2c856376f02..7651c60cb01 100644
--- a/app/assets/javascripts/discourse/views/invite-reply-button.js.es6
+++ b/app/assets/javascripts/discourse/views/invite-reply-button.js.es6
@@ -2,6 +2,7 @@ import ButtonView from 'discourse/views/button';
 import { iconHTML } from 'discourse/helpers/fa-icon';
 
 export default ButtonView.extend({
+  classNames: ['invite-topic'],
   textKey: 'topic.invite_reply.title',
   helpKey: 'topic.invite_reply.help',
   attributeBindings: ['disabled'],