diff --git a/setup_main_tex_file.py b/setup_main_tex_file.py
index eb36e2c..5329ae9 100755
--- a/setup_main_tex_file.py
+++ b/setup_main_tex_file.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 # -*- coding:utf-8 -*-
 
 import argparse