diff --git a/vcg/complex/algorithms/pointcloud_normal.h b/vcg/complex/algorithms/pointcloud_normal.h
index ffdf6d24..e8628dab 100644
--- a/vcg/complex/algorithms/pointcloud_normal.h
+++ b/vcg/complex/algorithms/pointcloud_normal.h
@@ -98,7 +98,7 @@ public:
     bool useViewPoint;  /// if the position of the viewpoint has to be used.
   };
 
-  static void Compute(MeshType &m, Param p, vcg::CallBackPos * cb)
+  static void Compute(MeshType &m, Param p, vcg::CallBackPos * cb=0)
   {
     tri::Allocator<MeshType>::CompactVertexVector(m);
     if(cb) cb(1,"Building KdTree...");