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-rw-r--r--boost/variant/recursive_wrapper_fwd.hpp1
1 files changed, 1 insertions, 0 deletions
diff --git a/boost/variant/recursive_wrapper_fwd.hpp b/boost/variant/recursive_wrapper_fwd.hpp
index b46774d92c..b42a68ffaf 100644
--- a/boost/variant/recursive_wrapper_fwd.hpp
+++ b/boost/variant/recursive_wrapper_fwd.hpp
@@ -15,6 +15,7 @@
#ifndef BOOST_VARIANT_RECURSIVE_WRAPPER_FWD_HPP
#define BOOST_VARIANT_RECURSIVE_WRAPPER_FWD_HPP
+#include <boost/mpl/bool.hpp>
#include "boost/mpl/aux_/config/ctps.hpp"
#include "boost/mpl/aux_/lambda_support.hpp"
#include <boost/type_traits/integral_constant.hpp>