diff --git a/stdlib/weakref.pyi b/stdlib/weakref.pyi
index 9dc723388..7685e0ba4 100644
--- a/stdlib/weakref.pyi
+++ b/stdlib/weakref.pyi
@@ -76,7 +76,7 @@ class WeakValueDictionary(MutableMapping[_KT, _VT]):
 
 class KeyedRef(ref[_T], Generic[_KT, _T]):
     key: _KT
-    def __new__(type, ob: _T, callback: Callable[[_T], Any], key: _KT) -> KeyedRef: ...
+    def __new__(type, ob: _T, callback: Callable[[_T], Any], key: _KT) -> KeyedRef[_KT, _T]: ...
     def __init__(self, ob: _T, callback: Callable[[_T], Any], key: _KT) -> None: ...
 
 class WeakKeyDictionary(MutableMapping[_KT, _VT]):
@@ -111,9 +111,9 @@ class WeakKeyDictionary(MutableMapping[_KT, _VT]):
 
 if sys.version_info >= (3, 4):
     class finalize:
-        def __init__(self, __obj: _S, __func: Callable[..., _T], *args: Any, **kwargs: Any) -> None: ...
-        def __call__(self, _: Any = ...) -> Optional[_T]: ...
-        def detach(self) -> Optional[Tuple[_S, _T, Tuple[Any, ...], Dict[str, Any]]]: ...
-        def peek(self) -> Optional[Tuple[_S, _T, Tuple[Any, ...], Dict[str, Any]]]: ...
+        def __init__(self, __obj: object, __func: Callable[..., Any], *args: Any, **kwargs: Any) -> None: ...
+        def __call__(self, _: Any = ...) -> Optional[Any]: ...
+        def detach(self) -> Optional[Tuple[Any, Any, Tuple[Any, ...], Dict[str, Any]]]: ...
+        def peek(self) -> Optional[Tuple[Any, Any, Tuple[Any, ...], Dict[str, Any]]]: ...
         alive: bool
         atexit: bool