diff --git a/ndnboost/unordered_set.hpp b/ndnboost/unordered_set.hpp
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+
+// Copyright (C) 2003-2004 Jeremy B. Maitin-Shepard.
+// Copyright (C) 2005-2008 Daniel James.
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+
+//  See http://www.boost.org/libs/unordered for documentation
+
+#ifndef BOOST_UNORDERED_SET_HPP_INCLUDED
+#define BOOST_UNORDERED_SET_HPP_INCLUDED
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1020)
+# pragma once
+#endif
+
+#include <ndnboost/unordered/unordered_set.hpp>
+
+#endif // BOOST_UNORDERED_SET_HPP_INCLUDED