diff --git a/boxes/generators/trafficlight.py b/boxes/generators/trafficlight.py
index 1c76c3b..6d055a0 100644
--- a/boxes/generators/trafficlight.py
+++ b/boxes/generators/trafficlight.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python3
+#-*- coding: utf-8 -*-
 # Copyright (C) 2013-2016 Florian Festi
 #
 #   This program is free software: you can redistribute it and/or modify