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-rw-r--r--boost/type_traits/is_assignable.hpp1
1 files changed, 1 insertions, 0 deletions
diff --git a/boost/type_traits/is_assignable.hpp b/boost/type_traits/is_assignable.hpp
index 9cf681dd31..49d171616a 100644
--- a/boost/type_traits/is_assignable.hpp
+++ b/boost/type_traits/is_assignable.hpp
@@ -9,6 +9,7 @@
#ifndef BOOST_TT_IS_ASSIGNABLE_HPP_INCLUDED
#define BOOST_TT_IS_ASSIGNABLE_HPP_INCLUDED
+#include <cstddef> // size_t
#include <boost/type_traits/integral_constant.hpp>
#include <boost/detail/workaround.hpp>