diff --git a/src/wireviz/wv_cli.py b/src/wireviz/wv_cli.py
index c9e2a3e..eb126e0 100644
--- a/src/wireviz/wv_cli.py
+++ b/src/wireviz/wv_cli.py
@@ -1,3 +1,5 @@
+# -*- coding: utf-8 -*-
+
 import os
 from pathlib import Path
 import sys