diff --git a/tests/auth_test.py b/tests/auth_test.py
index f8e18fd70..2b2decd98 100755
--- a/tests/auth_test.py
+++ b/tests/auth_test.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env vpython3
 # Copyright (c) 2017 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
diff --git a/tests/cipd_bootstrap_test.py b/tests/cipd_bootstrap_test.py
index b71a7ec5f..d345120c6 100755
--- a/tests/cipd_bootstrap_test.py
+++ b/tests/cipd_bootstrap_test.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env vpython3
 # Copyright (c) 2018 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
diff --git a/tests/git_number_test.py b/tests/git_number_test.py
index 5f7f23f03..dd15b5772 100755
--- a/tests/git_number_test.py
+++ b/tests/git_number_test.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env vpython3
 # Copyright 2013 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.