diff --git a/include/boost/concept_check.hpp b/include/boost/concept_check.hpp
index 353171a..95586b9 100644
--- a/include/boost/concept_check.hpp
+++ b/include/boost/concept_check.hpp
@@ -16,6 +16,7 @@
 #include <boost/config.hpp>
 #include <boost/iterator.hpp>
 #include <utility>
+#include <boost/type_traits/conversion_traits.hpp>
 #include <boost/static_assert.hpp>
 
 #if defined(BOOST_MSVC) || defined(__BORLANDC__)