diff --git a/include/boost/type_traits.hpp b/include/boost/type_traits.hpp
index 42b85c7..02eb0d8 100644
--- a/include/boost/type_traits.hpp
+++ b/include/boost/type_traits.hpp
@@ -40,6 +40,7 @@
 #include "boost/type_traits/is_member_pointer.hpp"
 #include "boost/type_traits/is_object.hpp"
 #include "boost/type_traits/is_POD.hpp"
+#include "boost/type_traits/is_polymorphic.hpp"
 #include "boost/type_traits/is_pointer.hpp"
 #include "boost/type_traits/is_reference.hpp"
 #include "boost/type_traits/is_same.hpp"