diff --git a/subcalc.py b/subcalc.py
index 3267e45..bed00ed 100755
--- a/subcalc.py
+++ b/subcalc.py
@@ -1,5 +1,5 @@
-#!/usr/bin/env python
-# -*- coding:utf-8 -*-
+#!/usr/bin/env python3
+
 import sys
 
 def subcalc(slash):