diff --git a/stubs/html5lib/html5lib/serializer.pyi b/stubs/html5lib/html5lib/serializer.pyi
index 5e230a05c..12ae9db51 100644
--- a/stubs/html5lib/html5lib/serializer.pyi
+++ b/stubs/html5lib/html5lib/serializer.pyi
@@ -1,4 +1,5 @@
 from _typeshed import Incomplete
+from collections.abc import Generator
 from typing import Any, overload
 
 def htmlentityreplace_errors(exc: Exception) -> tuple[str | bytes, int]: ...
@@ -31,7 +32,7 @@ class HTMLSerializer:
     def encode(self, string): ...
     def encodeStrict(self, string): ...
     encoding: Any
-    def serialize(self, treewalker, encoding: Incomplete | None = None) -> None: ...
+    def serialize(self, treewalker, encoding: Incomplete | None = None) -> Generator[Incomplete, None, None]: ...
     def render(self, treewalker, encoding: Incomplete | None = None): ...
     def serializeError(self, data: str = "XXX ERROR MESSAGE NEEDED") -> None: ...