diff --git a/cpp/src/barretenberg/serialize/msgpack_impl/variant_impl.hpp b/cpp/src/barretenberg/serialize/msgpack_impl/variant_impl.hpp
index 8241ba47ab..66fe6398be 100644
--- a/cpp/src/barretenberg/serialize/msgpack_impl/variant_impl.hpp
+++ b/cpp/src/barretenberg/serialize/msgpack_impl/variant_impl.hpp
@@ -9,8 +9,8 @@ namespace msgpack::adaptor {
 template<typename... T>
 struct pack<std::variant< T...>> {
     auto &operator()(auto& o, std::variant<T...> const &variant) const {
-        std::visit([&o](auto &&arg) { msgpack::pack(o, arg); }, variant);
+        std::visit([&o](const auto& arg) { o.pack(arg); }, variant);
         return o;
     }
 };
-}
\ No newline at end of file
+}