diff --git a/Include/moduleobject.h b/Include/moduleobject.h
index 00a23aa..8c3ba61 100644
--- a/Include/moduleobject.h
+++ b/Include/moduleobject.h
@@ -9,7 +9,7 @@
 
 extern DL_IMPORT(PyTypeObject) PyModule_Type;
 
-#define PyModule_Check(op) ((op)->ob_type == &PyModule_Type)
+#define PyModule_Check(op) PyObject_TypeCheck(op, &PyModule_Type)
 
 extern DL_IMPORT(PyObject *) PyModule_New(char *);
 extern DL_IMPORT(PyObject *) PyModule_GetDict(PyObject *);