diff --git a/utils/conv_codes_gsm.py b/utils/conv_codes_gsm.py
index eeed4fd..ec77660 100644
--- a/utils/conv_codes_gsm.py
+++ b/utils/conv_codes_gsm.py
@@ -1,5 +1,6 @@
-#!/usr/bin/python2
+#!/usr/bin/env python
 # -*- coding: utf-8 -*-
+
 from conv_gen import ConvolutionalCode
 from conv_gen import poly
 
diff --git a/utils/conv_gen.py b/utils/conv_gen.py
index 6b6b267..06283d8 100644
--- a/utils/conv_gen.py
+++ b/utils/conv_gen.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python2
+#!/usr/bin/env python
 
 mod_license = """
 /*