diff --git a/wrap/dae/colladaformat.h b/wrap/dae/colladaformat.h
index ec3bae06..6c8b4475 100644
--- a/wrap/dae/colladaformat.h
+++ b/wrap/dae/colladaformat.h
@@ -627,7 +627,7 @@ namespace Tags
 			{
 				for(unsigned int ii = 0; ii < nedge; ++ii)
 				{
-					int dist  = it->V(ii) - &(*m.vert.begin());
+					int dist  = vcg::tri::Index(m,it->cV(ii));
 					_text.push_back(QString::number(dist));
 					if (vcol)
 						_text.push_back(QString::number(dist));
@@ -650,7 +650,7 @@ namespace Tags
 				for(unsigned int ii = 0; ii < nedge; ++ii)
 				{
 					const typename MESHTYPE::FaceType& f = m.face[*it];
-					int dist  = f.V(ii) - &(*m.vert.begin());
+					int dist  = f.cV(ii) - &(*m.vert.begin());
 					_text.push_back(QString::number(dist));
 					if (vcol)
 						_text.push_back(QString::number(dist));
diff --git a/wrap/io_trimesh/export_idtf.h b/wrap/io_trimesh/export_idtf.h
index ea7b5a24..2cf6be0d 100644
--- a/wrap/io_trimesh/export_idtf.h
+++ b/wrap/io_trimesh/export_idtf.h
@@ -462,9 +462,9 @@ typedef typename SaveMeshType::CoordType CoordType;
 		idtf.write(3,"MESH_FACE_POSITION_LIST {");
 		for(ConstFaceIterator fit = m.face.begin();fit != m.face.end();++fit)  
 		{
-			idtf.write(4,TextUtility::nmbToStr(fit->V(0) - &(*m.vert.begin())) + " " +
-				TextUtility::nmbToStr(fit->V(1) - &(*m.vert.begin())) + " " + 
-				TextUtility::nmbToStr(fit->V(2) - &(*m.vert.begin())));
+			idtf.write(4,TextUtility::nmbToStr(fit->cV(0) - &(*m.vert.begin())) + " " +
+				TextUtility::nmbToStr(fit->cV(1) - &(*m.vert.begin())) + " " +
+				TextUtility::nmbToStr(fit->cV(2) - &(*m.vert.begin())));
 		}
 		idtf.write(3,"}");