diff --git a/vcg/complex/algorithms/voronoi_processing.h b/vcg/complex/algorithms/voronoi_processing.h
index 82401d23..845e7549 100644
--- a/vcg/complex/algorithms/voronoi_processing.h
+++ b/vcg/complex/algorithms/voronoi_processing.h
@@ -1224,7 +1224,7 @@ static int RestrictedVoronoiRelaxing(MeshType &m, std::vector<CoordType> &seedPo
       area[fi->V(i)]+=a3;
   }
 
-  assert(m.vn > seedPosVec.size()*20);
+  assert(m.vn > (int)seedPosVec.size()*20);
   int i;
   ScalarType perturb = m.bbox.Diag()*vpp.seedPerturbationAmount;
   for(i=0;i<relaxStep;++i)