diff --git a/stdlib/2and3/contextlib.pyi b/stdlib/2and3/contextlib.pyi
index 7d092096b..4aa07471f 100644
--- a/stdlib/2and3/contextlib.pyi
+++ b/stdlib/2and3/contextlib.pyi
@@ -18,6 +18,7 @@ if sys.version_info >= (3, 7):
     from typing import AsyncContextManager as AbstractAsyncContextManager
 
 _T = TypeVar('_T')
+_F = TypeVar('_F', bound=Callable[..., Any])
 
 _ExitFunc = Callable[[Optional[Type[BaseException]],
                       Optional[BaseException],
@@ -26,11 +27,11 @@ _CM_EF = TypeVar('_CM_EF', ContextManager, _ExitFunc)
 
 if sys.version_info >= (3, 2):
     class _GeneratorContextManager(ContextManager[_T], Generic[_T]):
-        def __call__(self, func: Callable[..., _T]) -> Callable[..., _T]: ...
+        def __call__(self, func: _F) -> _F: ...
     def contextmanager(func: Callable[..., Iterator[_T]]) -> Callable[..., _GeneratorContextManager[_T]]: ...
 else:
     class GeneratorContextManager(ContextManager[_T], Generic[_T]):
-        def __call__(self, func: Callable[..., _T]) -> Callable[..., _T]: ...
+        def __call__(self, func: _F) -> _F: ...
     def contextmanager(func: Callable[..., Iterator[_T]]) -> Callable[..., ContextManager[_T]]: ...
 
 if sys.version_info >= (3, 7):