diff --git a/Mesh/periodical.h b/Mesh/periodical.h
index 752438294b2e7536aa43cddbd9d0d9ba2bc14882..2fe068f48134f8ae9cdb610650400f26dcae93f9 100644
--- a/Mesh/periodical.h
+++ b/Mesh/periodical.h
@@ -29,6 +29,7 @@ class voroMetal3D{
   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&);
   void correspondance(double);
-  bool correspondance(double,double,double,double);
+  bool correspondance(double,double,double,double,int&);
+  void correspondance(double,double,double,double,int,bool&);
   bool equal(double,double,double);
 };