diff --git a/include/boost/interprocess/mem_algo/rbtree_best_fit.hpp b/include/boost/interprocess/mem_algo/rbtree_best_fit.hpp
index 37bac66..6ed18ab 100644
--- a/include/boost/interprocess/mem_algo/rbtree_best_fit.hpp
+++ b/include/boost/interprocess/mem_algo/rbtree_best_fit.hpp
@@ -31,11 +31,12 @@
 #include <boost/interprocess/detail/math_functions.hpp>
 #include <boost/interprocess/detail/type_traits.hpp>
 #include <boost/interprocess/sync/scoped_lock.hpp>
+#include <boost/type_traits/alignment_of.hpp>
 #include <boost/type_traits/type_with_alignment.hpp>
+#include <boost/type_traits/make_unsigned.hpp>
 #include <boost/intrusive/pointer_traits.hpp>
 #include <boost/assert.hpp>
 #include <boost/static_assert.hpp>
-#include <boost/type_traits.hpp>
 #include <algorithm>
 #include <utility>
 #include <climits>