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diff --git a/boost/log/detail/fake_mutex.hpp b/boost/log/detail/fake_mutex.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   fake_mutex.hpp
+ * \author Andrey Semashev
+ * \date   31.07.2011
+ *
+ * \brief  This header is the Boost.Log library implementation, see the library documentation
+ *         at http://www.boost.org/doc/libs/release/libs/log/doc/html/index.html.
+ */
+
+#ifndef BOOST_LOG_DETAIL_FAKE_MUTEX_HPP_INCLUDED_
+#define BOOST_LOG_DETAIL_FAKE_MUTEX_HPP_INCLUDED_
+
+#include <boost/log/detail/config.hpp>
+#include <boost/log/detail/header.hpp>
+
+#ifdef BOOST_HAS_PRAGMA_ONCE
+#pragma once
+#endif
+
+namespace boost {
+
+BOOST_LOG_OPEN_NAMESPACE
+
+namespace aux {
+
+//! Fake mutex that doesn't do anything. Note: we're not using \c null_mutex from Boost.Thread in order not to introduce false dependencies on Boost.Thread and Boost.Chrono.
+class fake_mutex
+{
+public:
+    BOOST_DEFAULTED_FUNCTION(fake_mutex(), {})
+    void lock() {}
+    bool try_lock() { return true; }
+    template< typename T >
+    bool timed_lock(T const&) { return true; }
+    void unlock() {}
+
+    // Copying prohibited
+    BOOST_DELETED_FUNCTION(fake_mutex(fake_mutex const&))
+    BOOST_DELETED_FUNCTION(fake_mutex& operator=(fake_mutex const&))
+};
+
+} // namespace aux
+
+BOOST_LOG_CLOSE_NAMESPACE // namespace log
+
+} // namespace boost
+
+#include <boost/log/detail/footer.hpp>
+
+#endif // BOOST_LOG_DETAIL_FAKE_MUTEX_HPP_INCLUDED_