diff --git a/stdlib/2.7/__builtin__.pyi b/stdlib/2.7/__builtin__.pyi
index 120007b73..e110a1a35 100644
--- a/stdlib/2.7/__builtin__.pyi
+++ b/stdlib/2.7/__builtin__.pyi
@@ -365,7 +365,7 @@ class str(basestring, Sequence[str]):
     def __ge__(self, x: unicode) -> bool: ...
     def __mod__(self, x: Any) -> str: ...
 
-class bytearray(Sequence[int]):
+class bytearray(MutableSequence[int]):
     @overload
     def __init__(self) -> None: ...
     @overload
@@ -431,10 +431,7 @@ class bytearray(Sequence[int]):
     @overload
     def __setitem__(self, s: slice, x: Union[Sequence[int], str]) -> None: ...
     def __setslice__(self, start: int, stop: int, x: Union[Sequence[int], str]) -> None: ...
-    @overload
-    def __delitem__(self, i: int) -> None: ...
-    @overload
-    def __delitem__(self, s: slice) -> None: ...
+    def __delitem__(self, i: Union[int, slice]) -> None: ...
     def __delslice__(self, start: int, stop: int) -> None: ...
     def __add__(self, s: str) -> bytearray: ...
     def __mul__(self, n: int) -> bytearray: ...