diff --git a/Objects/cobject.c b/Objects/cobject.c
index b2cae9a..a1ee686 100644
--- a/Objects/cobject.c
+++ b/Objects/cobject.c
@@ -135,8 +135,7 @@
 mechanism to link to one another.");
 
 PyTypeObject PyCObject_Type = {
-    PyObject_HEAD_INIT(&PyType_Type)
-    0,				/*ob_size*/
+    PyVarObject_HEAD_INIT(&PyType_Type, 0)
     "PyCObject",		/*tp_name*/
     sizeof(PyCObject),		/*tp_basicsize*/
     0,				/*tp_itemsize*/