diff --git a/Arrangement_on_surface_2/include/CGAL/Arr_tags.h b/Arrangement_on_surface_2/include/CGAL/Arr_tags.h
index 70e76fe31e3..273b7b0b710 100644
--- a/Arrangement_on_surface_2/include/CGAL/Arr_tags.h
+++ b/Arrangement_on_surface_2/include/CGAL/Arr_tags.h
@@ -21,6 +21,7 @@
 #ifndef CGAL_ARR_TAGS_H
 #define CGAL_ARR_TAGS_H
 
+#include <boost/type_traits.hpp>
 #include <boost/mpl/bool.hpp>
 #include <boost/mpl/if.hpp>
 #include <boost/mpl/and.hpp>