diff --git a/Include/traceback.h b/Include/traceback.h
index b77cc92..e7943da 100644
--- a/Include/traceback.h
+++ b/Include/traceback.h
@@ -19,7 +19,7 @@
 
 PyAPI_FUNC(int) PyTraceBack_Here(struct _frame *);
 PyAPI_FUNC(int) PyTraceBack_Print(PyObject *, PyObject *);
-PyAPI_FUNC(int) Py_DisplaySourceLine(PyObject *, const char *, int);
+PyAPI_FUNC(int) _Py_DisplaySourceLine(PyObject *, const char *, int, int);
 
 /* Reveal traceback type so we can typecheck traceback objects */
 PyAPI_DATA(PyTypeObject) PyTraceBack_Type;