diff --git a/include/boost/type_traits.hpp b/include/boost/type_traits.hpp
index c725296..acd5aff 100644
--- a/include/boost/type_traits.hpp
+++ b/include/boost/type_traits.hpp
@@ -1,4 +1,4 @@
-//  (C) Copyright John Maddock 2000. 
+//  (C) Copyright John Maddock 2000.
 //  Use, modification and distribution are subject to the Boost Software License,
 //  Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
 //  http://www.boost.org/LICENSE_1_0.txt).
@@ -32,6 +32,7 @@
 #include "boost/type_traits/has_nothrow_constructor.hpp"
 #include "boost/type_traits/has_nothrow_copy.hpp"
 #include "boost/type_traits/has_nothrow_destructor.hpp"
+#include <boost/type_traits/has_operator.hpp>
 #include "boost/type_traits/has_trivial_assign.hpp"
 #include "boost/type_traits/has_trivial_constructor.hpp"
 #include "boost/type_traits/has_trivial_copy.hpp"
@@ -93,7 +94,3 @@
 #include "boost/type_traits/ice.hpp"
 
 #endif // BOOST_TYPE_TRAITS_HPP
-
-
-
-