diff --git a/src/abstract_graph.py b/src/abstract_graph.py
index 43ec5a9..4ccbc0a 100755
--- a/src/abstract_graph.py
+++ b/src/abstract_graph.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python2
+#!/usr/bin/env python
 
 # This software is Copyright 2017 The Regents of the University of California. All Rights Reserved. Permission to copy, modify, and distribute this software and its documentation for educational, research and non-profit purposes, without fee, and without a written agreement is hereby granted, provided that the above copyright notice, this paragraph and the following three paragraphs appear in all copies. Permission to make commercial use of this software may be obtained by contacting:
 #