diff --git a/test/aux_async_model.py b/test/aux_async_model.py
index 4d3ba32..eb58fc4 100644
--- a/test/aux_async_model.py
+++ b/test/aux_async_model.py
@@ -1,4 +1,4 @@
-# coding: utf-8
+# -*- coding: utf-8 -*-
 
 import asyncio
 from pprint import pprint as pp