diff -Naru a/setup.py b/setup.py
--- a/setup.py	2017-11-10 13:58:37.000000000 +0100
+++ b/setup.py	2019-01-10 11:17:51.297349676 +0100
@@ -1,4 +1,5 @@
 #!/usr/bin/env python3
+# -*- coding: utf-8 -*-

 # This file is part of the Python aiocoap library project.
 #