diff --git a/test/to_svg.hpp b/test/to_svg.hpp
index b6865b5b0..bc6f02ea2 100644
--- a/test/to_svg.hpp
+++ b/test/to_svg.hpp
@@ -14,6 +14,8 @@
 #ifndef BOOST_GEOMETRY_TEST_TO_SVG_HPP
 #define BOOST_GEOMETRY_TEST_TO_SVG_HPP
 
+#include <fstream>
+
 #include <boost/geometry/io/wkt/read.hpp>
 #include <boost/geometry/io/svg/svg_mapper.hpp>
 #include <boost/geometry/algorithms/detail/overlay/get_turns.hpp>