diff --git a/vcg/simplex/vertex/with/atvnvm.h b/vcg/simplex/vertex/with/atvnvm.h
index 73cd32b2..a5d40e10 100644
--- a/vcg/simplex/vertex/with/atvnvm.h
+++ b/vcg/simplex/vertex/with/atvnvm.h
@@ -5,10 +5,12 @@
 
 #define __VCGLIB_VERTEX_AT
 #define __VCGLIB_VERTEX_VN
+#define __VCGLIB_VERTEX_VM
 
 #include <vcg/simplex/vertex/base.h> 
 
 #undef VERTEX_TYPE 
+#undef __VCGLIB_VERTEX_VM
 #undef __VCGLIB_VERTEX_AT
 #undef __VCGLIB_VERTEX_VN