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diff --git a/boost/parameter/aux_/as_lvalue.hpp b/boost/parameter/aux_/as_lvalue.hpp
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+++ b/boost/parameter/aux_/as_lvalue.hpp
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+// Copyright Daniel Wallin 2006.
+// 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)
+
+#ifndef BOOST_PARAMETER_AUX_AS_LVALUE_HPP
+#define BOOST_PARAMETER_AUX_AS_LVALUE_HPP
+
+namespace boost { namespace parameter { namespace aux {
+
+    template <typename T>
+    T const& as_lvalue(T const& value)
+    {
+        return value;
+    }
+
+    template <typename T>
+    T& as_lvalue(T& value)
+    {
+        return value;
+    }
+}}} // namespace boost::parameter::aux
+
+#endif  // include guard
+