diff --git a/stdlib/builtins.pyi b/stdlib/builtins.pyi
index 23779ad4e..87623557d 100644
--- a/stdlib/builtins.pyi
+++ b/stdlib/builtins.pyi
@@ -366,7 +366,7 @@ class str(Sequence[str]):
     @overload
     def __new__(cls: type[Self], object: object = ...) -> Self: ...
     @overload
-    def __new__(cls: type[Self], o: bytes, encoding: str = ..., errors: str = ...) -> Self: ...
+    def __new__(cls: type[Self], object: bytes, encoding: str = ..., errors: str = ...) -> Self: ...
     def capitalize(self) -> str: ...
     def casefold(self) -> str: ...
     def center(self, __width: SupportsIndex, __fillchar: str = ...) -> str: ...