diff --git a/certificate_checker_unittest.cc b/certificate_checker_unittest.cc
index ccff258..55168ba 100644
--- a/certificate_checker_unittest.cc
+++ b/certificate_checker_unittest.cc
@@ -1,10 +1,11 @@
-// Copyright (c) 2011 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.
 
 #include <string>
 
 #include <base/string_util.h>
+#include <base/stringprintf.h>
 #include <gmock/gmock.h>
 #include <gtest/gtest.h>
 #include <metrics/metrics_library_mock.h>