diff --git a/app/assets/javascripts/discourse/routes/topic.js b/app/assets/javascripts/discourse/routes/topic.js
index ed49b861534..b9d6aaf177f 100644
--- a/app/assets/javascripts/discourse/routes/topic.js
+++ b/app/assets/javascripts/discourse/routes/topic.js
@@ -5,12 +5,13 @@ import DiscourseRoute from "discourse/routes/discourse";
 import DiscourseURL from "discourse/lib/url";
 import { ID_CONSTRAINT } from "discourse/models/topic";
 import Evented from "@ember/object/evented";
+import EmberObject from "@ember/object";
 
 const SCROLL_DELAY = 500;
 
 import showModal from "discourse/lib/show-modal";
 
-const TopicRoute = DiscourseRoute.extend(Evented, {
+const TopicRoute = DiscourseRoute.extend({
   init() {
     this._super(...arguments);
 
@@ -332,4 +333,9 @@ const TopicRoute = DiscourseRoute.extend(Evented, {
   }
 });
 
+// TODO: Remove this - it's barely used.
+const events = EmberObject.extend(Evented).create();
+TopicRoute.on = events.on;
+TopicRoute.trigger = events.trigger;
+
 export default TopicRoute;