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diff --git a/boost/fusion/sequence/intrinsic/back.hpp b/boost/fusion/sequence/intrinsic/back.hpp
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+++ b/boost/fusion/sequence/intrinsic/back.hpp
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+/*=============================================================================
+    Copyright (c) 2001-2011 Joel de Guzman
+
+    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)
+==============================================================================*/
+#if !defined(FUSION_BACK_09162005_0350)
+#define FUSION_BACK_09162005_0350
+
+#include <boost/fusion/sequence/intrinsic_fwd.hpp>
+#include <boost/fusion/sequence/intrinsic/end.hpp>
+#include <boost/fusion/iterator/prior.hpp>
+#include <boost/fusion/iterator/deref.hpp>
+#include <boost/mpl/bool.hpp>
+
+namespace boost { namespace fusion
+{
+    struct fusion_sequence_tag;
+
+    namespace result_of
+    {
+        template <typename Sequence>
+        struct back
+            : result_of::deref<typename result_of::prior<typename result_of::end<Sequence>::type>::type>
+        {};
+    }
+    
+    template <typename Sequence>
+    inline typename result_of::back<Sequence>::type
+    back(Sequence& seq)
+    {
+        return *fusion::prior(fusion::end(seq));
+    }
+
+    template <typename Sequence>
+    inline typename result_of::back<Sequence const>::type
+    back(Sequence const& seq)
+    {
+        return *fusion::prior(fusion::end(seq));
+    }
+}}
+
+#endif