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diff --git a/extra/guile/scm/detail/function_args.hpp b/extra/guile/scm/detail/function_args.hpp
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+++ b/extra/guile/scm/detail/function_args.hpp
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+//
+// immer: immutable data structures for C++
+// Copyright (C) 2016, 2017, 2018 Juan Pedro Bolivar Puente
+//
+// This software is distributed under the Boost Software License, Version 1.0.
+// See accompanying file LICENSE or copy at http://boost.org/LICENSE_1_0.txt
+//
+
+#pragma once
+
+#include <scm/detail/pack.hpp>
+#include <boost/callable_traits/args.hpp>
+
+namespace scm {
+namespace detail {
+
+template <typename Fn>
+using function_args_t = boost::callable_traits::args_t<Fn, pack>;
+
+} // namespace detail
+} // namespace scm