diff --git a/docs/src/test-advanced-js.md b/docs/src/test-advanced-js.md
index 1192712aa6..5322742901 100644
--- a/docs/src/test-advanced-js.md
+++ b/docs/src/test-advanced-js.md
@@ -561,7 +561,7 @@ test('numeric ranges', () => {
 
 For TypeScript, also add the following to `global.d.ts`. You don't need it for JavaScript.
 
-```ts
+```js js-flavor=ts
 // global.d.ts
 declare global {
  namespace PlaywrightTest {