diff --git a/vcg/complex/algorithms/polygonal_algorithms.h b/vcg/complex/algorithms/polygonal_algorithms.h
index 6d1807de..fbf0a5ab 100644
--- a/vcg/complex/algorithms/polygonal_algorithms.h
+++ b/vcg/complex/algorithms/polygonal_algorithms.h
@@ -609,7 +609,7 @@ public:
                 //safety checks
                 if (weightSum[i]>0)
                     newP=avgPos[i]/weightSum[i];
-                if (isnan(newP.X())||isnan(newP.Y())||isnan(newP.Z()))
+                if (std::isnan(newP.X())|| std::isnan(newP.Y())|| std::isnan(newP.Z()))
                      newP=poly_m.vert[i].P();
                 if ((newP-poly_m.vert[i].P()).Norm()>poly_m.bbox.Diag())
                     newP=poly_m.vert[i].P();
diff --git a/vcg/complex/algorithms/update/topology.h b/vcg/complex/algorithms/update/topology.h
index a71f63e9..5e4f9633 100644
--- a/vcg/complex/algorithms/update/topology.h
+++ b/vcg/complex/algorithms/update/topology.h
@@ -82,9 +82,9 @@ public:
     assert (tp != 0);
     assert (nz >= 0 && nz < 4);
     
-    v[0] = tp->cV(Tetra::VofF(nz, 0));
-    v[1] = tp->cV(Tetra::VofF(nz, 1));
-    v[2] = tp->cV(Tetra::VofF(nz, 2));
+    v[0] = tp->V(Tetra::VofF(nz, 0));
+    v[1] = tp->V(Tetra::VofF(nz, 1));
+    v[2] = tp->V(Tetra::VofF(nz, 2));
     
     assert(v[0] != v[1] && v[1] != v[2]); //no degenerate faces