diff --git a/stdlib/typing.pyi b/stdlib/typing.pyi
index 15959d768..943329804 100644
--- a/stdlib/typing.pyi
+++ b/stdlib/typing.pyi
@@ -366,7 +366,7 @@ class MutableSequence(Sequence[_T], Generic[_T]):
     def reverse(self) -> None: ...
     def pop(self, index: int = ...) -> _T: ...
     def remove(self, value: _T) -> None: ...
-    def __iadd__(self, x: Iterable[_T]) -> MutableSequence[_T]: ...
+    def __iadd__(self: Self, x: Iterable[_T]) -> Self: ...
 
 class AbstractSet(Collection[_T_co], Generic[_T_co]):
     @abstractmethod