diff --git a/Include/typeslots.h b/Include/typeslots.h
index f56749d..a89d73b 100644
--- a/Include/typeslots.h
+++ b/Include/typeslots.h
@@ -79,3 +79,4 @@
 #define Py_am_await 77
 #define Py_am_aiter 78
 #define Py_am_anext 79
+#define Py_tp_finalize 80
diff --git a/Objects/typeslots.inc b/Objects/typeslots.inc
index bcbe0af..dc750cc 100644
--- a/Objects/typeslots.inc
+++ b/Objects/typeslots.inc
@@ -78,3 +78,4 @@ offsetof(PyHeapTypeObject, as_number.nb_inplace_matrix_multiply),
 offsetof(PyHeapTypeObject, as_async.am_await),
 offsetof(PyHeapTypeObject, as_async.am_aiter),
 offsetof(PyHeapTypeObject, as_async.am_anext),
+offsetof(PyHeapTypeObject, ht_type.tp_finalize),