diff --git a/unit_tests.py b/unit_tests.py
index fbee8efb4..ba16c75ae 100644
--- a/unit_tests.py
+++ b/unit_tests.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2
 # -*- coding: utf-8 -*-
 """
     Blockstack-client