diff --git a/extras/trainers.py b/extras/trainers.py
index 5ae70fea3..fbad4e1cd 100644
--- a/extras/trainers.py
+++ b/extras/trainers.py
@@ -1,3 +1,4 @@
+# -*- coding: utf-8 -*-
 # url: http://hax.iimarck.us/topic/8/
 
 # for fixing trainer_group_names