diff --git a/include/meta_util.hpp b/include/meta_util.hpp
index 695b382..cec0265 100644
--- a/include/meta_util.hpp
+++ b/include/meta_util.hpp
@@ -29,7 +29,7 @@ namespace rest_rpc{
         typedef Ret(*pointer)(Arg, Args...);
 
         typedef std::tuple<Arg, Args...> tuple_type;
-        typedef std::tuple<Arg, std::remove_const_t<std::remove_reference_t<Args>>...> bare_tuple_type;
+        typedef std::tuple<std::remove_const_t<std::remove_reference_t<Arg>>, std::remove_const_t<std::remove_reference_t<Args>>...> bare_tuple_type;
         using args_tuple = std::tuple<std::string, Arg, std::remove_const_t<std::remove_reference_t<Args>>...>;
         using args_tuple_2nd = std::tuple<std::string, std::remove_const_t<std::remove_reference_t<Args>>...>;
     };