diff --git a/Include/longobject.h b/Include/longobject.h
index 71815e5..2b40461 100644
--- a/Include/longobject.h
+++ b/Include/longobject.h
@@ -51,6 +51,7 @@
 PyAPI_FUNC(PY_LONG_LONG) PyLong_AsLongLong(PyObject *);
 PyAPI_FUNC(unsigned PY_LONG_LONG) PyLong_AsUnsignedLongLong(PyObject *);
 PyAPI_FUNC(unsigned PY_LONG_LONG) PyLong_AsUnsignedLongLongMask(PyObject *);
+PyAPI_FUNC(PY_LONG_LONG) PyLong_AsLongLongAndOverflow(PyObject *, int *);
 #endif /* HAVE_LONG_LONG */
 
 PyAPI_FUNC(PyObject *) PyLong_FromString(char *, char **, int);