diff --git a/vcg/complex/trimesh/point_sampling.h b/vcg/complex/trimesh/point_sampling.h
index 9dd6e2b1..84cd178b 100644
--- a/vcg/complex/trimesh/point_sampling.h
+++ b/vcg/complex/trimesh/point_sampling.h
@@ -35,6 +35,8 @@ Each function calls many time the sample object with the sampling point as param
 #ifndef __VCGLIB_POINT_SAMPLING
 #define __VCGLIB_POINT_SAMPLING
 #include <vcg/complex/trimesh/stat.h>
+#include <vcg/complex/trimesh/update/topology.h>
+#include <vcg/space/box2.h>
 namespace vcg
 {
 namespace tri