make sure to initialize the method wrapper type
diff --git a/Include/descrobject.h b/Include/descrobject.h
index f715fe1..646b3cc 100644
--- a/Include/descrobject.h
+++ b/Include/descrobject.h
@@ -77,6 +77,7 @@
 PyAPI_DATA(PyTypeObject) PyMethodDescr_Type;
 PyAPI_DATA(PyTypeObject) PyWrapperDescr_Type;
 PyAPI_DATA(PyTypeObject) PyDictProxy_Type;
+PyAPI_DATA(PyTypeObject) _PyMethodWrapper_Type;
 
 PyAPI_FUNC(PyObject *) PyDescr_NewMethod(PyTypeObject *, PyMethodDef *);
 PyAPI_FUNC(PyObject *) PyDescr_NewClassMethod(PyTypeObject *, PyMethodDef *);