diff --git a/stdlib/_ctypes.pyi b/stdlib/_ctypes.pyi
index c2b612c38bff..25d604218a00 100644
--- a/stdlib/_ctypes.pyi
+++ b/stdlib/_ctypes.pyi
@@ -22,6 +22,9 @@ RTLD_LOCAL: int
 if sys.version_info >= (3, 11):
     CTYPES_MAX_ARGCOUNT: int
 
+if sys.version_info >= (3, 12):
+    SIZEOF_TIME_T: int
+
 if sys.platform == "win32":
     # Description, Source, HelpFile, HelpContext, scode
     _COMError_Details: TypeAlias = tuple[str | None, str | None, str | None, int | None, int | None]
diff --git a/stdlib/ctypes/__init__.pyi b/stdlib/ctypes/__init__.pyi
index 7a185a5b523e..b14fb93c8163 100644
--- a/stdlib/ctypes/__init__.pyi
+++ b/stdlib/ctypes/__init__.pyi
@@ -181,6 +181,9 @@ class c_bool(_SimpleCData[bool]):
 if sys.platform == "win32":
     class HRESULT(_SimpleCData[int]): ...  # TODO undocumented
 
+if sys.version_info >= (3, 12):
+    c_time_t: type[c_int32 | c_int64]
+
 class py_object(_CanCastTo, _SimpleCData[_T]): ...
 class BigEndianStructure(Structure): ...
 class LittleEndianStructure(Structure): ...
diff --git a/tests/stubtest_allowlists/py312.txt b/tests/stubtest_allowlists/py312.txt
index 194a3b7dc3ad..e3811a782f95 100644
--- a/tests/stubtest_allowlists/py312.txt
+++ b/tests/stubtest_allowlists/py312.txt
@@ -1,5 +1,4 @@
 # Uncategorised, from Python 3.12
-_ctypes.SIZEOF_TIME_T
 argparse.BooleanOptionalAction.__init__
 array.array.__class_getitem__
 asyncio.BaseEventLoop.create_connection
@@ -22,7 +21,6 @@ collections.UserDict.get
 configparser.ParsingError.__init__
 configparser.RawConfigParser.readfp
 configparser.__all__
-ctypes.c_time_t
 datetime.__all__
 email.utils.localtime
 enum.Enum.__signature__