diff --git a/main.py b/main.py
index 878f9df..624eb82 100755
--- a/main.py
+++ b/main.py
@@ -1,3 +1,4 @@
+#!/usr/bin/python3
 # Copyright 2021 László Párkányi
 #
 # Licensed under the Apache License, Version 2.0 (the "License");