diff --git a/include/sta/tacos.hpp b/include/sta/tacos.hpp
index b92f699..c5d6edc 100644
--- a/include/sta/tacos.hpp
+++ b/include/sta/tacos.hpp
@@ -68,7 +68,7 @@ namespace sta
 		 * @ingroup tacos_api
 		 */
 		template<typename T, typename ... Args>
-		std::shared_ptr<T> addThread(std::list<uint16_t> states, Args ... args)
+		std::shared_ptr<T> addThread(std::set<uint16_t> states, Args ... args)
 		{
 			std::shared_ptr<T> thread_ptr = std::make_shared<T>(args...);