diff --git a/tools/schema_generator.py b/tools/schema_generator.py
index c84e24b73..12e03bf86 100755
--- a/tools/schema_generator.py
+++ b/tools/schema_generator.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 #    Copyright (C) 2014 Yahoo! Inc. All Rights Reserved.
 #
diff --git a/tools/state_graph.py b/tools/state_graph.py
index cc70fb2a7..acc80226a 100755
--- a/tools/state_graph.py
+++ b/tools/state_graph.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 #    Copyright (C) 2014 Yahoo! Inc. All Rights Reserved.
 #
diff --git a/tools/subunit_trace.py b/tools/subunit_trace.py
index 948eefc3b..eb66ef36a 100755
--- a/tools/subunit_trace.py
+++ b/tools/subunit_trace.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 # Copyright 2014 Hewlett-Packard Development Company, L.P.
 # Copyright 2014 Samsung Electronics