diff --git a/docs/guide/mocking/globals.md b/docs/guide/mocking/globals.md
index fe195628c..28e84332d 100644
--- a/docs/guide/mocking/globals.md
+++ b/docs/guide/mocking/globals.md
@@ -7,12 +7,12 @@ By default, Vitest does not reset these globals, but you can turn on the [`unstu
 ```ts
 import { vi } from 'vitest'
 
-const IntersectionObserverMock = vi.fn(() => ({
-  disconnect: vi.fn(),
-  observe: vi.fn(),
-  takeRecords: vi.fn(),
-  unobserve: vi.fn(),
-}))
+const IntersectionObserverMock = vi.fn(class {
+  disconnect = vi.fn()
+  observe = vi.fn()
+  takeRecords = vi.fn()
+  unobserve = vi.fn()
+})
 
 vi.stubGlobal('IntersectionObserver', IntersectionObserverMock)