diff --git a/tools/copy_dart.py b/tools/copy_dart.py
index 059b85b69e0..dbb7ecf33e7 100755
--- a/tools/copy_dart.py
+++ b/tools/copy_dart.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/python2.7
 # Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.