diff --git a/include/boost/geometry/algorithms/detail/overlay/sort_by_side.hpp b/include/boost/geometry/algorithms/detail/overlay/sort_by_side.hpp
index bbba623ee..89bb7241d 100644
--- a/include/boost/geometry/algorithms/detail/overlay/sort_by_side.hpp
+++ b/include/boost/geometry/algorithms/detail/overlay/sort_by_side.hpp
@@ -10,8 +10,10 @@
 #define BOOST_GEOMETRY_ALGORITHMS_DETAIL_OVERLAY_SORT_BY_SIDE_HPP
 
 #include <algorithm>
+#include <map>
 #include <vector>
 
+#include <boost/geometry/algorithms/detail/overlay/copy_segment_point.hpp>
 #include <boost/geometry/algorithms/detail/direction_code.hpp>
 #include <boost/geometry/algorithms/detail/overlay/turn_info.hpp>
 #include <boost/geometry/strategies/side.hpp>