diff --git a/include/boost/type_traits/type_traits_test.hpp b/include/boost/type_traits/type_traits_test.hpp
index c8feddf..bb9177a 100644
--- a/include/boost/type_traits/type_traits_test.hpp
+++ b/include/boost/type_traits/type_traits_test.hpp
@@ -11,6 +11,7 @@
 #define BOOST_TYPE_TRAITS_TEST_HPP
 #include <iostream>
 #include <typeinfo>
+#include <boost/config.hpp>
 #include <boost/utility.hpp>
 //
 // define tests here