diff --git a/selftest.py b/selftest.py
old mode 100644
new mode 100755
index 7829bae5b..067db4d79
--- a/selftest.py
+++ b/selftest.py
@@ -1,3 +1,4 @@
+#!/usr/bin/env python
 # minimal sanity check
 from __future__ import print_function