diff --git a/stdlib/2.7/__builtin__.pyi b/stdlib/2.7/__builtin__.pyi
index 3097c92a4..da45aa59c 100644
--- a/stdlib/2.7/__builtin__.pyi
+++ b/stdlib/2.7/__builtin__.pyi
@@ -492,7 +492,7 @@ class list(MutableSequence[_T], Generic[_T]):
     def insert(self, index: int, object: _T) -> None: ...
     def remove(self, object: _T) -> None: ...
     def reverse(self) -> None: ...
-    def sort(self, *, key: Callable[[_T], Any] = ..., reverse: bool = ...) -> None: ...
+    def sort(self, cmp: Callable[[_T, _T], Any] = ..., key: Callable[[_T], Any] = ..., reverse: bool = ...) -> None: ...
 
     def __len__(self) -> int: ...
     def __iter__(self) -> Iterator[_T]: ...