PEP 3123: Provide forward compatibility with Python 3.0, while keeping
backwards compatibility. Add Py_Refcnt, Py_Type, Py_Size, and
PyVarObject_HEAD_INIT.
diff --git a/Include/dictobject.h b/Include/dictobject.h
index ec2e0c8..fec6295 100644
--- a/Include/dictobject.h
+++ b/Include/dictobject.h
@@ -91,8 +91,8 @@
 PyAPI_DATA(PyTypeObject) PyDict_Type;
 
 #define PyDict_Check(op) \
-                 PyType_FastSubclass((op)->ob_type, Py_TPFLAGS_DICT_SUBCLASS)
-#define PyDict_CheckExact(op) ((op)->ob_type == &PyDict_Type)
+                 PyType_FastSubclass(Py_Type(op), Py_TPFLAGS_DICT_SUBCLASS)
+#define PyDict_CheckExact(op) (Py_Type(op) == &PyDict_Type)
 
 PyAPI_FUNC(PyObject *) PyDict_New(void);
 PyAPI_FUNC(PyObject *) PyDict_GetItem(PyObject *mp, PyObject *key);