diff --git a/app/assets/javascripts/discourse/components/mount-widget.js.es6 b/app/assets/javascripts/discourse/components/mount-widget.js.es6
index 171ab375a5c..d8431f28205 100644
--- a/app/assets/javascripts/discourse/components/mount-widget.js.es6
+++ b/app/assets/javascripts/discourse/components/mount-widget.js.es6
@@ -4,12 +4,16 @@ import { queryRegistry } from "discourse/widgets/widget";
 import { getRegister } from "discourse-common/lib/get-owner";
 import DirtyKeys from "discourse/lib/dirty-keys";
 
-const _cleanCallbacks = {};
+let _cleanCallbacks = {};
 export function addWidgetCleanCallback(widgetName, fn) {
   _cleanCallbacks[widgetName] = _cleanCallbacks[widgetName] || [];
   _cleanCallbacks[widgetName].push(fn);
 }
 
+export function resetWidgetCleanCallbacks() {
+  _cleanCallbacks = {};
+}
+
 export default Ember.Component.extend({
   _tree: null,
   _rootNode: null,
diff --git a/test/javascripts/helpers/qunit-helpers.js.es6 b/test/javascripts/helpers/qunit-helpers.js.es6
index 759e64f7064..d67f9ae1240 100644
--- a/test/javascripts/helpers/qunit-helpers.js.es6
+++ b/test/javascripts/helpers/qunit-helpers.js.es6
@@ -13,6 +13,7 @@ import { flushMap } from "discourse/models/store";
 import { clearRewrites } from "discourse/lib/url";
 import { initSearchData } from "discourse/widgets/search-menu";
 import { resetDecorators } from "discourse/widgets/widget";
+import { resetWidgetCleanCallbacks } from "discourse/components/mount-widget";
 import { resetDecorators as resetPostCookedDecorators } from "discourse/widgets/post-cooked";
 import { resetCache as resetOneboxCache } from "pretty-text/oneboxer";
 import { resetCustomPostMessageCallbacks } from "discourse/controllers/topic";
@@ -126,6 +127,7 @@ export function acceptance(name, options) {
       initSearchData();
       resetDecorators();
       resetPostCookedDecorators();
+      resetWidgetCleanCallbacks();
       resetOneboxCache();
       resetCustomPostMessageCallbacks();
       Discourse.reset();