diff --git a/stdlib/2.7/typing.pyi b/stdlib/2.7/typing.pyi
index f29c48254..edd0a8d00 100644
--- a/stdlib/2.7/typing.pyi
+++ b/stdlib/2.7/typing.pyi
@@ -60,7 +60,7 @@ class SupportsRound(Generic[_T]):
     @abstractmethod
     def __round__(self, ndigits: int = ...) -> _T: ...
 
-class Reversible(Generic[_T]):
+class Reversible(Generic[_T_co]):
     @abstractmethod
     def __reversed__(self) -> Iterator[_T]: ...
 
diff --git a/stdlib/3/typing.pyi b/stdlib/3/typing.pyi
index da4f69f8f..783874d47 100644
--- a/stdlib/3/typing.pyi
+++ b/stdlib/3/typing.pyi
@@ -70,7 +70,7 @@ class SupportsRound(Generic[_T]):
     @abstractmethod
     def __round__(self, ndigits: int = ...) -> _T: ...
 
-class Reversible(Generic[_T]):
+class Reversible(Generic[_T_co]):
     @abstractmethod
     def __reversed__(self) -> Iterator[_T]: ...