diff --git a/avb/avbtool b/avb/avbtool
index 2830e20..647d344 100755
--- a/avb/avbtool
+++ b/avb/avbtool
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2.7
 
 # Copyright 2016, The Android Open Source Project
 #