diff --git a/parallel_hashmap/phmap_utils.h b/parallel_hashmap/phmap_utils.h
index ef29f08..3cbfcfc 100644
--- a/parallel_hashmap/phmap_utils.h
+++ b/parallel_hashmap/phmap_utils.h
@@ -345,7 +345,8 @@ private:
     _hash_helper(const std::tuple<P...> &t) const noexcept {
         const auto &el = std::get<I>(t);
         using el_type = typename std::remove_cv<typename std::remove_reference<decltype(el)>::type>::type;
-        return phmap::Hash<el_type>()(el) + _hash_helper<I + 1>(t);
+        return Combiner<size_t, sizeof(size_t)>()(
+            phmap::Hash<el_type>()(el),  _hash_helper<I + 1>(t));
     }
 };