diff --git a/a_sync/iter.py b/a_sync/iter.py
index 4618b529..1bb804bc 100644
--- a/a_sync/iter.py
+++ b/a_sync/iter.py
@@ -57,7 +57,7 @@ def __iter__(self) -> Iterator[T]:
         yield from ASyncIterator(self.__aiter__())
     __slots__ = "__wrapped__", 
 
-AsyncGenFunc = Callable[P, Union[AsyncGenerator[Any, None, T], AsyncIterator[T]]]
+AsyncGenFunc = Callable[P, Union[AsyncGenerator[T, None], AsyncIterator[T]]]
 
 class ASyncIterator(_AwaitableAsyncIterableMixin[T], Iterator[T]):
     """