diff --git a/libs/util/include/psemek/util/ecs.hpp b/libs/util/include/psemek/util/ecs.hpp
index 3ad11836..f9a775ea 100644
--- a/libs/util/include/psemek/util/ecs.hpp
+++ b/libs/util/include/psemek/util/ecs.hpp
@@ -460,7 +460,7 @@ namespace psemek::util
 
 		std::string_view species_name(species_handle species) const { return species_[species.value]->name(); }
 
-		species_handle entity_species(entity_handle entity) const { return {ecs_detail::unpack(entity.value).species}; }
+		static species_handle entity_species(entity_handle entity) { return {ecs_detail::unpack(entity.value).species}; }
 
 		entity_handle add_entity(species_handle species);
 		ecs_detail::entity_id entity_count(species_handle species) const;