diff --git a/test_utils.cc b/test_utils.cc
index 0a30ddf..7e77519 100644
--- a/test_utils.cc
+++ b/test_utils.cc
@@ -1,4 +1,4 @@
-// Copyright (c) 2009 The Chromium OS Authors. All rights reserved.
+// Copyright (c) 2012 The Chromium OS Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
@@ -16,6 +16,7 @@
 #include <vector>
 
 #include "base/string_util.h"
+#include <base/stringprintf.h>
 #include "base/logging.h"
 #include "update_engine/file_writer.h"
 #include "update_engine/filesystem_iterator.h"