diff --git a/subprocess.cc b/subprocess.cc
index f0647e2..aec8bb7 100644
--- a/subprocess.cc
+++ b/subprocess.cc
@@ -1,4 +1,4 @@
-// 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.
 
@@ -14,6 +14,7 @@
 #include <base/logging.h>
 #include <base/memory/scoped_ptr.h>
 #include <base/string_util.h>
+#include <base/stringprintf.h>
 
 #include "update_engine/utils.h"