diff --git a/stdlib/2and3/ctypes/__init__.pyi b/stdlib/2and3/ctypes/__init__.pyi
index 3a9b096c6..f06fa7396 100644
--- a/stdlib/2and3/ctypes/__init__.pyi
+++ b/stdlib/2and3/ctypes/__init__.pyi
@@ -152,11 +152,11 @@ def byref(obj: _CData, offset: int = ...) -> _CArgObject: ...
 _CastT = TypeVar("_CastT", bound=_CanCastTo)
 
 def cast(obj: _UnionT[_CData, _CArgObject, int], type: Type[_CastT]) -> _CastT: ...
-def create_string_buffer(init_or_size: _UnionT[int, bytes], size: Optional[int] = ...) -> Array[c_char]: ...
+def create_string_buffer(init: _UnionT[int, bytes], size: Optional[int] = ...) -> Array[c_char]: ...
 
 c_buffer = create_string_buffer
 
-def create_unicode_buffer(init_or_size: _UnionT[int, Text], size: Optional[int] = ...) -> Array[c_wchar]: ...
+def create_unicode_buffer(init: _UnionT[int, Text], size: Optional[int] = ...) -> Array[c_wchar]: ...
 
 if sys.platform == "win32":
     def DllCanUnloadNow() -> int: ...