diff --git a/stdlib/_operator.pyi b/stdlib/_operator.pyi
index c36077673..12fabd9be 100644
--- a/stdlib/_operator.pyi
+++ b/stdlib/_operator.pyi
@@ -48,7 +48,7 @@ def abs(__a: SupportsAbs[_T]) -> _T: ...
 def add(__a: Any, __b: Any) -> Any: ...
 def and_(__a: Any, __b: Any) -> Any: ...
 def floordiv(__a: Any, __b: Any) -> Any: ...
-def index(__a: Any) -> int: ...
+def index(__a: SupportsIndex) -> int: ...
 def inv(__a: _SupportsInversion[_T_co]) -> _T_co: ...
 def invert(__a: _SupportsInversion[_T_co]) -> _T_co: ...
 def lshift(__a: Any, __b: Any) -> Any: ...