diff --git a/vcg/simplex/tetrahedron/with/tn.h b/vcg/simplex/tetrahedron/with/tn.h
new file mode 100644
index 00000000..93cd2d8a
--- /dev/null
+++ b/vcg/simplex/tetrahedron/with/tn.h
@@ -0,0 +1,14 @@
+#ifndef __VCGLIB_TETRA_TN_TYPE
+#define __VCGLIB_TETRA_TN_TYPE
+
+#define TETRA_TYPE TetraTN 
+
+#define __VCGLIB_TETRA_TN
+
+#include <vcg/simplex/tetrahedron/base.h> 
+
+#undef TETRA_TYPE 
+
+#undef __VCGLIB_TETRA_TN
+
+#endif