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diff --git a/boost/parameter/aux_/pack/tag_deduced.hpp b/boost/parameter/aux_/pack/tag_deduced.hpp
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+++ b/boost/parameter/aux_/pack/tag_deduced.hpp
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+// Copyright David Abrahams, Daniel Wallin 2003.
+// 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_PACK_TAG_DEDUCED_HPP
+#define BOOST_PARAMETER_AUX_PACK_TAG_DEDUCED_HPP
+
+#include <boost/parameter/aux_/set.hpp>
+#include <boost/parameter/aux_/pack/tag_type.hpp>
+#include <boost/parameter/config.hpp>
+
+#if defined(BOOST_PARAMETER_CAN_USE_MP11)
+#include <boost/mp11/list.hpp>
+#include <boost/mp11/utility.hpp>
+#else
+#include <boost/mpl/pair.hpp>
+#include <boost/mpl/apply_wrap.hpp>
+#endif
+
+namespace boost { namespace parameter { namespace aux {
+
+    // Tags a deduced argument Arg with the keyword tag of Spec using TagFn.
+    // Returns the tagged argument and the mpl::set<> UsedArgs with the
+    // tag of Spec inserted.
+    template <typename UsedArgs, typename Spec, typename Arg, typename TagFn>
+    struct tag_deduced
+    {
+#if defined(BOOST_PARAMETER_CAN_USE_MP11)
+        using type = ::boost::mp11::mp_list<
+            ::boost::mp11::mp_apply_q<
+                TagFn
+              , ::boost::mp11::mp_list<
+                    typename ::boost::parameter::aux::tag_type<Spec>::type
+                  , Arg
+                >
+            >
+#else
+        typedef ::boost::mpl::pair<
+            typename ::boost::mpl::apply_wrap2<
+                TagFn
+              , typename ::boost::parameter::aux::tag_type<Spec>::type
+              , Arg
+            >::type
+#endif  // BOOST_PARAMETER_CAN_USE_MP11
+          , typename ::boost::parameter::aux::insert_<
+                UsedArgs
+              , typename ::boost::parameter::aux::tag_type<Spec>::type
+            >::type
+#if defined(BOOST_PARAMETER_CAN_USE_MP11)
+        >;
+#else
+        > type;
+#endif
+    };
+}}} // namespace boost::parameter::aux
+
+#endif  // include guard
+