diff --git a/app/javascript/mastodon/features/ui/components/__tests__/column-test.jsx b/app/javascript/mastodon/features/ui/components/__tests__/column-test.jsx
index eab9c7114bf..f84d2ab9db3 100644
--- a/app/javascript/mastodon/features/ui/components/__tests__/column-test.jsx
+++ b/app/javascript/mastodon/features/ui/components/__tests__/column-test.jsx
@@ -7,9 +7,6 @@ const fakeIcon = () => <span />;
 describe('<Column />', () => {
   describe('<ColumnHeader /> click handler', () => {
     it('runs the scroll animation if the column contains scrollable content', () => {
-      vi.useFakeTimers({
-        toFake: ['requestIdleCallback']
-      });
       const scrollToMock = vi.fn();
       const { container } = render(
         <Column heading='notifications' icon='notifications' iconComponent={fakeIcon}>
@@ -18,7 +15,6 @@ describe('<Column />', () => {
       );
       container.querySelector('.scrollable').scrollTo = scrollToMock;
       fireEvent.click(screen.getByText('notifications'));
-      vi.runAllTimers();
       expect(scrollToMock).toHaveBeenCalledWith({ behavior: 'smooth', top: 0 });
     });
 
diff --git a/app/javascript/mastodon/test_helpers.tsx b/app/javascript/mastodon/test_helpers.tsx
index 4f17f62e13d..ae1f1cd4f6e 100644
--- a/app/javascript/mastodon/test_helpers.tsx
+++ b/app/javascript/mastodon/test_helpers.tsx
@@ -7,6 +7,15 @@ import { render as rtlRender } from '@testing-library/react';
 
 import { IdentityContext } from './identity_context';
 
+beforeAll(() => {
+  global.requestIdleCallback = vi.fn((cb: IdleRequestCallback) => {
+    // @ts-expect-error IdleRequestCallback expects an argument of type IdleDeadline,
+    // but that doesn't exist in this environment.
+    cb();
+    return 0;
+  });
+});
+
 function render(
   ui: React.ReactElement,
   {