diff --git a/utils.hpp b/utils.hpp
index 298a91d..9f82b47 100644
--- a/utils.hpp
+++ b/utils.hpp
@@ -32,7 +32,7 @@
     template <typename T, typename Arg, typename Enable = void>
     struct Make
     {
-        static auto make(Arg&& arg)
+        static auto make(Arg&& /* arg */)
         {
             throw std::runtime_error(
                 std::string("Invalid conversion in MakeVariantVisitor::") +