diff --git a/Modules/mmapmodule.c b/Modules/mmapmodule.c
index 091ecd6..a92954b 100644
--- a/Modules/mmapmodule.c
+++ b/Modules/mmapmodule.c
@@ -782,8 +782,7 @@
 };
 
 static PyTypeObject mmap_object_type = {
-	PyObject_HEAD_INIT(0) /* patched in module init */
-	0,					/* ob_size */
+	PyVarObject_HEAD_INIT(0, 0) /* patched in module init */
 	"mmap.mmap",				/* tp_name */
 	sizeof(mmap_object),			/* tp_size */
 	0,					/* tp_itemsize */
@@ -1141,7 +1140,7 @@
 	PyObject *dict, *module;
 
 	/* Patch the object type */
-	mmap_object_type.ob_type = &PyType_Type;
+	Py_Type(&mmap_object_type) = &PyType_Type;
 
 	module = Py_InitModule("mmap", mmap_functions);
 	if (module == NULL)