diff --git a/docs/src/api/class-page.md b/docs/src/api/class-page.md
index 1f72bc2149..4d252112cd 100644
--- a/docs/src/api/class-page.md
+++ b/docs/src/api/class-page.md
@@ -2364,7 +2364,7 @@ await page.evaluate("globalThis.suspectWeakRef = new WeakRef(suspect)")
 # 2. Request garbage collection.
 await page.request_gc()
 # 3. Check that weak ref does not deref to the original object.
-assert page.evaluate("!globalThis.suspectWeakRef.deref()")
+assert await page.evaluate("!globalThis.suspectWeakRef.deref()")
 ```
 
 ```python sync