diff --git a/stdlib/multiprocessing/connection.pyi b/stdlib/multiprocessing/connection.pyi
index cc9f5cf8f890..5036f0ef222b 100644
--- a/stdlib/multiprocessing/connection.pyi
+++ b/stdlib/multiprocessing/connection.pyi
@@ -1,7 +1,7 @@
 import socket
 import sys
 import types
-from _typeshed import Self
+from _typeshed import ReadableBuffer, Self
 from collections.abc import Iterable
 from typing import Any, Union
 from typing_extensions import SupportsIndex, TypeAlias
@@ -21,7 +21,7 @@ class _ConnectionBase:
     def writable(self) -> bool: ...  # undocumented
     def fileno(self) -> int: ...
     def close(self) -> None: ...
-    def send_bytes(self, buf: bytes, offset: int = ..., size: int | None = ...) -> None: ...
+    def send_bytes(self, buf: ReadableBuffer, offset: int = ..., size: int | None = ...) -> None: ...
     def send(self, obj: Any) -> None: ...
     def recv_bytes(self, maxlength: int | None = ...) -> bytes: ...
     def recv_bytes_into(self, buf: Any, offset: int = ...) -> int: ...