diff --git a/app/assets/javascripts/discourse/app/widgets/header.js b/app/assets/javascripts/discourse/app/widgets/header.js
index 0c445bbe37c..bbb665c6083 100644
--- a/app/assets/javascripts/discourse/app/widgets/header.js
+++ b/app/assets/javascripts/discourse/app/widgets/header.js
@@ -14,12 +14,16 @@ import { logSearchLinkClick } from "discourse/lib/search";
 import RenderGlimmer from "discourse/widgets/render-glimmer";
 import { hbs } from "ember-cli-htmlbars";
 
-const _extraHeaderIcons = [];
+let _extraHeaderIcons = [];
 
 export function addToHeaderIcons(icon) {
   _extraHeaderIcons.push(icon);
 }
 
+export function clearExtraHeaderIcons() {
+  _extraHeaderIcons = [];
+}
+
 const dropdown = {
   buildClasses(attrs) {
     let classes = attrs.classNames || [];
diff --git a/app/assets/javascripts/discourse/tests/helpers/qunit-helpers.js b/app/assets/javascripts/discourse/tests/helpers/qunit-helpers.js
index 965f16710ba..205e7f61925 100644
--- a/app/assets/javascripts/discourse/tests/helpers/qunit-helpers.js
+++ b/app/assets/javascripts/discourse/tests/helpers/qunit-helpers.js
@@ -71,6 +71,7 @@ import {
 } from "discourse/lib/to-markdown";
 import { clearTagsHtmlCallbacks } from "discourse/lib/render-tags";
 import { clearToolbarCallbacks } from "discourse/components/d-editor";
+import { clearExtraHeaderIcons } from "discourse/widgets/header";
 import { resetSidebarSection } from "discourse/lib/sidebar/custom-sections";
 import { resetNotificationTypeRenderers } from "discourse/lib/notification-item";
 
@@ -202,6 +203,7 @@ export function testCleanup(container, app) {
   clearToolbarCallbacks();
   resetSidebarSection();
   resetNotificationTypeRenderers();
+  clearExtraHeaderIcons();
 }
 
 export function discourseModule(name, options) {