diff --git a/delta_performer.cc b/delta_performer.cc
index 66c23d4..471ce82 100644
--- a/delta_performer.cc
+++ b/delta_performer.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/memory/scoped_ptr.h>
 #include <base/string_util.h>
+#include <base/stringprintf.h>
 #include <google/protobuf/repeated_field.h>
 
 #include "update_engine/bzip_extent_writer.h"