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-rw-r--r--boost/type_traits/rank.hpp1
1 files changed, 1 insertions, 0 deletions
diff --git a/boost/type_traits/rank.hpp b/boost/type_traits/rank.hpp
index 3dfc693687..1f820f1a55 100644
--- a/boost/type_traits/rank.hpp
+++ b/boost/type_traits/rank.hpp
@@ -10,6 +10,7 @@
#ifndef BOOST_TT_RANK_HPP_INCLUDED
#define BOOST_TT_RANK_HPP_INCLUDED
+#include <cstddef> // size_t
#include <boost/type_traits/integral_constant.hpp>
namespace boost {