diff --git a/libs/util/include/psemek/util/ecs.hpp b/libs/util/include/psemek/util/ecs.hpp
index da204f15..b364783e 100644
--- a/libs/util/include/psemek/util/ecs.hpp
+++ b/libs/util/include/psemek/util/ecs.hpp
@@ -5,6 +5,7 @@
 #include <psemek/util/function.hpp>
 #include <psemek/util/range.hpp>
 #include <psemek/util/hash.hpp>
+#include <psemek/util/hstring.hpp>
 
 #include <cstdint>
 #include <typeindex>
@@ -708,7 +709,7 @@ namespace psemek::util
 
 	private:
 		std::vector<std::unique_ptr<ecs_detail::species_base>> species_;
-		std::unordered_map<std::string, ecs_detail::species_handle, util::any_hash, std::equal_to<>> species_by_name_;
+		std::unordered_map<util::hstring, ecs_detail::species_handle> species_by_name_;
 
 		std::unordered_map<std::type_index, std::vector<util::function<void(void const *)>>> event_subscribers_;