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diff --git a/boost/chrono/io/duration_style.hpp b/boost/chrono/io/duration_style.hpp
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+++ b/boost/chrono/io/duration_style.hpp
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+//  (C) Copyright Howard Hinnant
+//  (C) Copyright 2011 Vicente J. Botet Escriba
+//  Use, modification and distribution are 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).
+//
+// This code was adapted by Vicente from Howard Hinnant's experimental work
+// on chrono i/o to Boost
+
+#ifndef BOOST_CHRONO_IO_DURATION_STYLE_HPP
+#define BOOST_CHRONO_IO_DURATION_STYLE_HPP
+
+#include <boost/detail/scoped_enum_emulation.hpp>
+
+namespace boost
+{
+  namespace chrono
+  {
+    /**
+     * Scoped enumeration emulation stating whether the duration I/O style is long or short.
+     * prefix means duration::rep with whatever stream/locale settings are set for it followed by a long name representing the unit
+     * symbol means duration::rep with whatever stream/locale settings are set for it followed by a SI unit abbreviation
+     */
+    BOOST_SCOPED_ENUM_DECLARE_BEGIN(duration_style)
+          {
+            prefix, symbol
+          }
+    BOOST_SCOPED_ENUM_DECLARE_END(duration_style)
+
+
+  } // chrono
+
+}
+
+#endif  // header