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diff --git a/boost/serialization/weak_ptr.hpp b/boost/serialization/weak_ptr.hpp
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+++ b/boost/serialization/weak_ptr.hpp
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+#ifndef BOOST_SERIALIZATION_WEAK_PTR_HPP
+#define BOOST_SERIALIZATION_WEAK_PTR_HPP
+
+// MS compatible compilers support #pragma once
+#if defined(_MSC_VER) && (_MSC_VER >= 1020)
+# pragma once
+#endif
+
+/////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8
+// shared_ptr.hpp: serialization for boost shared pointer
+
+// (C) Copyright 2004 Robert Ramey and Martin Ecker
+// Use, modification and distribution is subject to 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 for updates, documentation, and revision history.
+
+#include <boost/weak_ptr.hpp>
+#include <boost/serialization/shared_ptr.hpp>
+
+namespace boost {
+namespace serialization{
+
+template<class Archive, class T>
+inline void save(
+    Archive & ar,
+    const boost::weak_ptr< T > &t,
+    const unsigned int /* file_version */
+){
+    const boost::shared_ptr< T > sp = t.lock();
+    ar << boost::serialization::make_nvp("weak_ptr", sp);
+}
+
+template<class Archive, class T>
+inline void load(
+    Archive & ar,
+    boost::weak_ptr< T > &t,
+    const unsigned int /* file_version */
+){
+    boost::shared_ptr< T > sp;
+    ar >> boost::serialization::make_nvp("weak_ptr", sp);
+    t = sp;
+}
+
+template<class Archive, class T>
+inline void serialize(
+    Archive & ar,
+    boost::weak_ptr< T > &t,
+    const unsigned int file_version
+){
+    boost::serialization::split_free(ar, t, file_version);
+}
+
+} // namespace serialization
+} // namespace boost
+
+#endif // BOOST_SERIALIZATION_WEAK_PTR_HPP