diff --git a/stdlib/_typeshed/__init__.pyi b/stdlib/_typeshed/__init__.pyi
index 25054b601a4f..b786923880e1 100644
--- a/stdlib/_typeshed/__init__.pyi
+++ b/stdlib/_typeshed/__init__.pyi
@@ -142,6 +142,9 @@ class SupportsIter(Protocol[_T_co]):
 class SupportsAiter(Protocol[_T_co]):
     def __aiter__(self) -> _T_co: ...
 
+class SupportsLen(Protocol):
+    def __len__(self) -> int: ...
+
 class SupportsLenAndGetItem(Protocol[_T_co]):
     def __len__(self) -> int: ...
     def __getitem__(self, k: int, /) -> _T_co: ...
diff --git a/stdlib/ctypes/__init__.pyi b/stdlib/ctypes/__init__.pyi
index 9da972240abb..19bd261c67e0 100644
--- a/stdlib/ctypes/__init__.pyi
+++ b/stdlib/ctypes/__init__.pyi
@@ -23,7 +23,7 @@ from _ctypes import (
     set_errno as set_errno,
     sizeof as sizeof,
 )
-from _typeshed import StrPath
+from _typeshed import StrPath, SupportsBool, SupportsLen
 from ctypes._endian import BigEndianStructure as BigEndianStructure, LittleEndianStructure as LittleEndianStructure
 from types import GenericAlias
 from typing import Any, ClassVar, Final, Generic, Literal, TypeVar, overload, type_check_only
@@ -217,7 +217,7 @@ class py_object(_CanCastTo, _SimpleCData[_T]):
 
 class c_bool(_SimpleCData[bool]):
     _type_: ClassVar[Literal["?"]]
-    def __init__(self, value: bool = ...) -> None: ...
+    def __init__(self, value: SupportsBool | SupportsLen | None = ...) -> None: ...
 
 class c_byte(_SimpleCData[int]):
     _type_: ClassVar[Literal["b"]]