diff --git a/patacrep/latex/detex.py b/patacrep/latex/detex.py
index ebfd721b..d99c3467 100644
--- a/patacrep/latex/detex.py
+++ b/patacrep/latex/detex.py
@@ -1,3 +1,4 @@
+# -*- coding: utf-8 -*-
 """Render `very simple` TeX commands in a simple TeX code."""
 
 import logging
diff --git a/setup.py b/setup.py
index 74be3198..7810c5ca 100755
--- a/setup.py
+++ b/setup.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python3
+#!/usr/bin/env python
 
 """Installation script for songbook.
 
diff --git a/songbook b/songbook
index e3bcf555..f8fbd2a8 100755
--- a/songbook
+++ b/songbook
@@ -1,4 +1,4 @@
-#! /usr/bin/env python3
+#! /usr/bin/env python
 # -*- coding: utf-8 -*-
 
 """Command line tool to compile songbooks using the songbook library."""