diff --git a/stdlib/3/unittest/mock.pyi b/stdlib/3/unittest/mock.pyi
index b47e3f6ba..0c34f72dd 100644
--- a/stdlib/3/unittest/mock.pyi
+++ b/stdlib/3/unittest/mock.pyi
@@ -193,7 +193,7 @@ class _patch(Generic[_T]):
         kwargs: Mapping[str, Any],
     ) -> None: ...
     def copy(self) -> _patch[_T]: ...
-    def __call__(self, func: _T) -> _T: ...
+    def __call__(self, func: _F) -> _F: ...
     def decorate_class(self, klass: _TT) -> _TT: ...
     def decorate_callable(self, func: _F) -> _F: ...
     def get_original(self) -> Tuple[Any, bool]: ...
diff --git a/third_party/2and3/mock.pyi b/third_party/2and3/mock.pyi
index b47e3f6ba..0c34f72dd 100644
--- a/third_party/2and3/mock.pyi
+++ b/third_party/2and3/mock.pyi
@@ -193,7 +193,7 @@ class _patch(Generic[_T]):
         kwargs: Mapping[str, Any],
     ) -> None: ...
     def copy(self) -> _patch[_T]: ...
-    def __call__(self, func: _T) -> _T: ...
+    def __call__(self, func: _F) -> _F: ...
     def decorate_class(self, klass: _TT) -> _TT: ...
     def decorate_callable(self, func: _F) -> _F: ...
     def get_original(self) -> Tuple[Any, bool]: ...