diff --git a/test_http_server.cc b/test_http_server.cc
index 6257e07..08cf8e5 100644
--- a/test_http_server.cc
+++ b/test_http_server.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.
 
@@ -28,6 +28,7 @@
 #include <base/logging.h>
 #include <base/string_split.h>
 #include <base/string_util.h>
+#include <base/stringprintf.h>
 
 #include "update_engine/http_common.h"
 #include "update_engine/http_fetcher_unittest.h"