diff --git a/libsrc/interface/writeuser.cpp b/libsrc/interface/writeuser.cpp
index b4659b53..99a88dde 100644
--- a/libsrc/interface/writeuser.cpp
+++ b/libsrc/interface/writeuser.cpp
@@ -58,10 +58,11 @@ namespace netgen
 
 bool WriteUserFormat (const string & format,
 		      const Mesh & mesh,
-		      const NetgenGeometry & hgeom,
 		      const string & filename)
 {
-  const CSGeometry & geom = *dynamic_cast<const CSGeometry*> (&hgeom);
+  // cout << "write user &hgeom = " << &hgeom << endl;
+  // const CSGeometry & geom = *dynamic_cast<const CSGeometry*> (&hgeom);
+  const CSGeometry & geom = *dynamic_pointer_cast<CSGeometry> (mesh.GetGeometry());  
 
   PrintMessage (1, "Export mesh to file ", filename,
 		", format is ", format);
diff --git a/libsrc/interface/writeuser.hpp b/libsrc/interface/writeuser.hpp
index 04bdeeb0..5ceda0ba 100644
--- a/libsrc/interface/writeuser.hpp
+++ b/libsrc/interface/writeuser.hpp
@@ -159,9 +159,9 @@ extern void DLL_HEADER RegisterUserFormats (Array<const char*> & names,
 
 
 extern bool DLL_HEADER WriteUserFormat (const string & format,
-                             const Mesh & mesh,
-                             const NetgenGeometry & geom,
-                             const string & filename);
+                                        const Mesh & mesh,
+                                        // const NetgenGeometry & geom,
+                                        const string & filename);
 
 }
 
diff --git a/libsrc/meshing/python_mesh.cpp b/libsrc/meshing/python_mesh.cpp
index bd7a31da..aaed8073 100644
--- a/libsrc/meshing/python_mesh.cpp
+++ b/libsrc/meshing/python_mesh.cpp
@@ -509,7 +509,7 @@ DLL_HEADER void ExportNetgenMeshing(py::module &m)
     .def("Export",
          [] (Mesh & self, string filename, string format)
           {
-            if (WriteUserFormat (format, self, *self.GetGeometry(), filename))
+            if (WriteUserFormat (format, self, /* *self.GetGeometry(), */ filename))
               {
                 string err = string ("nothing known about format")+format;
                 Array<const char*> names, extensions;
diff --git a/ng/ngpkg.cpp b/ng/ngpkg.cpp
index a649a7a2..5d29d8f3 100644
--- a/ng/ngpkg.cpp
+++ b/ng/ngpkg.cpp
@@ -362,7 +362,7 @@ namespace netgen
     PrintMessage (1, "Export mesh to file ", filename, ".... Please Wait!");
 
     // CSGeometry * geometry = dynamic_cast<CSGeometry*> (ng_geometry);
-    if (WriteUserFormat (filetype, *mesh, *ng_geometry, filename))
+    if (WriteUserFormat (filetype, *mesh, /* *ng_geometry, */ filename))
       {
 	ostringstream ost;
 	ost << "Sorry, nothing known about file format " << filetype << endl;
diff --git a/nglib/nglib.cpp b/nglib/nglib.cpp
index e12910df..5fea184c 100644
--- a/nglib/nglib.cpp
+++ b/nglib/nglib.cpp
@@ -1250,6 +1250,6 @@ void Ng_InitSolutionData (Ng_SolutionData * soldata) { ; }
 #include <../interface/writeuser.hpp>
 void MyDummyToForceLinkingLibInterface(Mesh &mesh, NetgenGeometry &geom)
 {
-  netgen::WriteUserFormat("", mesh, geom, "");
+  netgen::WriteUserFormat("", mesh, /* geom, */ "");
 }