diff --git a/Modules/_ctypes/ctypes.h b/Modules/_ctypes/ctypes.h
index a232a4bc832067..a93d573b72b2da 100644
--- a/Modules/_ctypes/ctypes.h
+++ b/Modules/_ctypes/ctypes.h
@@ -112,12 +112,12 @@ extern int PyObject_stginfo(PyObject *self, Py_ssize_t *psize, Py_ssize_t *palig
 
 
 extern PyTypeObject PyCData_Type;
-#define CDataObject_CheckExact(v)       ((v)->ob_type == &PyCData_Type)
+#define CDataObject_CheckExact(v)       (Py_TYPE(v) == &PyCData_Type)
 #define CDataObject_Check(v)            PyObject_TypeCheck(v, &PyCData_Type)
 #define _CDataObject_HasExternalBuffer(v)  ((v)->b_ptr != (char *)&(v)->b_value)
 
 extern PyTypeObject PyCSimpleType_Type;
-#define PyCSimpleTypeObject_CheckExact(v)       ((v)->ob_type == &PyCSimpleType_Type)
+#define PyCSimpleTypeObject_CheckExact(v)       (Py_TYPE(v) == &PyCSimpleType_Type)
 #define PyCSimpleTypeObject_Check(v)    PyObject_TypeCheck(v, &PyCSimpleType_Type)
 
 extern PyTypeObject PyCField_Type;