diff --git a/include/boost/move/detail/meta_utils.hpp b/include/boost/move/detail/meta_utils.hpp
index e45394c..f16e185 100644
--- a/include/boost/move/detail/meta_utils.hpp
+++ b/include/boost/move/detail/meta_utils.hpp
@@ -67,6 +67,8 @@ typedef bool_<false>       false_;
 //              nat
 //////////////////////////////////////
 struct nat{};
+struct nat2{};
+struct nat3{};
 
 //////////////////////////////////////
 //          yes_type/no_type