diff --git a/Mesh/periodical.h b/Mesh/periodical.h
index 2fe068f48134f8ae9cdb610650400f26dcae93f9..b9020644154ad8cf1ddd081ded2e6a03d8c7bf4e 100644
--- a/Mesh/periodical.h
+++ b/Mesh/periodical.h
@@ -25,6 +25,7 @@ class voroMetal3D{
   void print_geo_point(int,double,double,double,std::ofstream&);
   void print_geo_line(int,int,int,std::ofstream&);
   void print_geo_face(int,int,std::ofstream&);
+  void print_geo_physical_face(int,int,std::ofstream&);
   void print_geo_volume(int,int,std::ofstream&);
   void print_geo_line_loop(int,std::vector<int>&,std::vector<int>&,std::ofstream&);
   void print_geo_face_loop(int,std::vector<int>&,std::ofstream&);