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-rw-r--r--boost/icl/concept/element_map.hpp1
1 files changed, 1 insertions, 0 deletions
diff --git a/boost/icl/concept/element_map.hpp b/boost/icl/concept/element_map.hpp
index d54df02182..b2d78abbed 100644
--- a/boost/icl/concept/element_map.hpp
+++ b/boost/icl/concept/element_map.hpp
@@ -11,6 +11,7 @@ Copyright (c) 2010-2010: Joachim Faulhaber
#include <boost/mpl/and.hpp>
#include <boost/mpl/not.hpp>
#include <boost/icl/detail/on_absorbtion.hpp>
+#include <boost/icl/type_traits/unit_element.hpp>
#include <boost/icl/type_traits/is_total.hpp>
#include <boost/icl/type_traits/absorbs_identities.hpp>
#include <boost/icl/type_traits/is_associative_element_container.hpp>