diff --git a/BGL/include/CGAL/boost/graph/IO/GOCAD.h b/BGL/include/CGAL/boost/graph/IO/GOCAD.h
index beca3bd820c..be61c8cd997 100644
--- a/BGL/include/CGAL/boost/graph/IO/GOCAD.h
+++ b/BGL/include/CGAL/boost/graph/IO/GOCAD.h
@@ -235,7 +235,7 @@ bool write_GOCAD(std::ostream& os,
         "END_ORIGINAL_COORDINATE_SYSTEM\n"
         "TFACE\n";
 
-  os.precision(16);
+  os.precision(17);
 
   boost::container::flat_map<vertex_descriptor, vertices_size_type> reindex;