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diff --git a/boost/log/sinks/event_log_constants.hpp b/boost/log/sinks/event_log_constants.hpp
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+/*
+ *          Copyright Andrey Semashev 2007 - 2014.
+ * 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)
+ */
+/*!
+ * \file   event_log_constants.hpp
+ * \author Andrey Semashev
+ * \date   07.11.2008
+ *
+ * The header contains definition of constants related to Windows NT Event Log API.
+ * The constants can be used in other places without the event log backend.
+ */
+
+#ifndef BOOST_LOG_SINKS_EVENT_LOG_CONSTANTS_HPP_INCLUDED_
+#define BOOST_LOG_SINKS_EVENT_LOG_CONSTANTS_HPP_INCLUDED_
+
+#include <boost/log/detail/config.hpp>
+
+#ifdef BOOST_HAS_PRAGMA_ONCE
+#pragma once
+#endif
+
+#ifndef BOOST_LOG_WITHOUT_EVENT_LOG
+
+#include <boost/log/detail/tagged_integer.hpp>
+#include <boost/log/detail/header.hpp>
+
+namespace boost {
+
+BOOST_LOG_OPEN_NAMESPACE
+
+namespace sinks {
+
+namespace event_log {
+
+    struct event_id_tag;
+    //! A tagged integral type that represents event identifier for the Windows API
+    typedef boost::log::aux::tagged_integer< unsigned int, event_id_tag > event_id;
+    /*!
+     * The function constructs event identifier from an integer
+     */
+    inline event_id make_event_id(unsigned int id)
+    {
+        event_id iden = { id };
+        return iden;
+    }
+
+    struct event_category_tag;
+    //! A tagged integral type that represents event category for the Windows API
+    typedef boost::log::aux::tagged_integer< unsigned short, event_category_tag > event_category;
+    /*!
+     * The function constructs event category from an integer
+     */
+    inline event_category make_event_category(unsigned short cat)
+    {
+        event_category category = { cat };
+        return category;
+    }
+
+    //! Windows event types
+    enum event_type
+    {
+        success = 0,                 //!< Equivalent to EVENTLOG_SUCCESS
+        info = 4,                    //!< Equivalent to EVENTLOG_INFORMATION_TYPE
+        warning = 2,                 //!< Equivalent to EVENTLOG_WARNING_TYPE
+        error = 1                    //!< Equivalent to EVENTLOG_ERROR_TYPE
+    };
+
+    /*!
+     * The function constructs log record level from an integer
+     */
+    BOOST_LOG_API event_type make_event_type(unsigned short lev);
+
+} // namespace event_log
+
+} // namespace sinks
+
+BOOST_LOG_CLOSE_NAMESPACE // namespace log
+
+} // namespace boost
+
+#include <boost/log/detail/footer.hpp>
+
+#endif // BOOST_LOG_WITHOUT_EVENT_LOG
+
+#endif // BOOST_LOG_SINKS_EVENT_LOG_CONSTANTS_HPP_INCLUDED_