diff --git a/libsrc/occ/occgeom.hpp b/libsrc/occ/occgeom.hpp
index c7118ced..22bd1428 100644
--- a/libsrc/occ/occgeom.hpp
+++ b/libsrc/occ/occgeom.hpp
@@ -420,8 +420,8 @@ namespace netgen
     //bool FastProject (int surfi, Point<3> & ap, double& u, double& v) const;
   };
 
-  void Identify(const ListOfShapes & me, const ListOfShapes & you, string name, Identifications::ID_TYPE type, Transformation<3> trafo);
-  void Identify(const TopoDS_Shape & me, const TopoDS_Shape & you, string name, Identifications::ID_TYPE type, std::optional<std::variant<gp_Trsf, gp_GTrsf>> opt_trafo);
+  DLL_HEADER void Identify(const ListOfShapes & me, const ListOfShapes & you, string name, Identifications::ID_TYPE type, Transformation<3> trafo);
+  DLL_HEADER void Identify(const TopoDS_Shape & me, const TopoDS_Shape & you, string name, Identifications::ID_TYPE type, std::optional<std::variant<gp_Trsf, gp_GTrsf>> opt_trafo);
    
 
   void PrintContents (OCCGeometry * geom);