diff --git a/bin/pygrun b/bin/pygrun
index 96f1b40..dd01add 100755
--- a/bin/pygrun
+++ b/bin/pygrun
@@ -1,4 +1,4 @@
-#!python
+#!/usr/bin/env python3
 __author__ = 'jszheng'
 import optparse
 import sys
