diff --git a/libs/util/include/psemek/util/function.hpp b/libs/util/include/psemek/util/function.hpp
index 15f8a458..d7679a2f 100644
--- a/libs/util/include/psemek/util/function.hpp
+++ b/libs/util/include/psemek/util/function.hpp
@@ -39,7 +39,9 @@ namespace psemek::util
 		function (function &&) noexcept;
 		function & operator = (function &&) noexcept;
 
+		function (function &) = delete;
 		function (function const &) = delete;
+		function & operator = (function &) = delete;
 		function & operator = (function const &) = delete;
 
 		~function();