diff --git a/test/algorithms/test_set_ops_pl_pl.hpp b/test/algorithms/test_set_ops_pl_pl.hpp
index 7005444d1..7919b992e 100644
--- a/test/algorithms/test_set_ops_pl_pl.hpp
+++ b/test/algorithms/test_set_ops_pl_pl.hpp
@@ -19,6 +19,7 @@ namespace bg = ::boost::geometry;
 #include "to_svg.hpp"
 
 #include <algorithm>
+#include <fstream>
 #include <boost/geometry/policies/compare.hpp>
 #include <boost/geometry/algorithms/equals.hpp>