diff --git a/Objects/moduleobject.c b/Objects/moduleobject.c
index f2fed30..fd48ff1 100644
--- a/Objects/moduleobject.c
+++ b/Objects/moduleobject.c
@@ -221,7 +221,7 @@
 PyTypeObject PyModule_Type = {
     PyVarObject_HEAD_INIT(&PyType_Type, 0)
     "module",                                   /* tp_name */
-    sizeof(PyModuleObject),                     /* tp_size */
+    sizeof(PyModuleObject),                     /* tp_basicsize */
     0,                                          /* tp_itemsize */
     (destructor)module_dealloc,                 /* tp_dealloc */
     0,                                          /* tp_print */