diff --git a/include/boost/type_traits/type_traits_test.hpp b/include/boost/type_traits/type_traits_test.hpp
index bb9177a..c1a8ac2 100644
--- a/include/boost/type_traits/type_traits_test.hpp
+++ b/include/boost/type_traits/type_traits_test.hpp
@@ -361,7 +361,7 @@ struct int_convertible
 // used to verify that is_empty does not emit
 // spurious warnings or errors.
 //
-struct non_empty : boost::noncopyable
+struct non_empty : private boost::noncopyable
 {
    int i;
 };