diff --git a/vcg/simplex/edge/pos.h b/vcg/simplex/edge/pos.h
index 527b087c..7d7d846d 100644
--- a/vcg/simplex/edge/pos.h
+++ b/vcg/simplex/edge/pos.h
@@ -60,7 +60,7 @@ public:
 	/// Local index of the vertex
 	int z;
 	/// Default Constructor
-	VertexStar() {}
+  VertexStar() : e(0), z(0) {}
 	/// Constructor which associates the EdgePos elementet with a face and its edge
 	VertexStar(EDGETYPE  * const ep, int const zp)
 	{
diff --git a/vcg/simplex/face/pos.h b/vcg/simplex/face/pos.h
index 9b844f1b..d970734e 100644
--- a/vcg/simplex/face/pos.h
+++ b/vcg/simplex/face/pos.h
@@ -71,7 +71,7 @@ public:
 	VertexType *v;
 
 	/// Default constructor
-	Pos(){}
+  Pos() : f(0), z(-1), v(0) {}
 	/// Constructor which associates the half-edge element with a face, its edge and its vertex
 	/// \note that the input must be consistent, e.g. it should hold that \c vp==fp->V0(zp) or \c vp==fp->V1(zp)
 	Pos(FaceType * const fp, int const zp, VertexType * const vp)
@@ -414,7 +414,7 @@ public:
 	int z;
 
 	/// Default constructor
-	VFIterator(){}
+  VFIterator() : f(0), z(-1) {}
 	/// Constructor which associates the half-edge elementet with a face and its vertex
 	VFIterator(FaceType * _f,  const int &  _z){f = _f; z = _z;  assert(z>=0 && "VFAdj must be initialized");}
 
diff --git a/vcg/simplex/tetrahedron/pos.h b/vcg/simplex/tetrahedron/pos.h
index 2c62c092..6d2873ad 100644
--- a/vcg/simplex/tetrahedron/pos.h
+++ b/vcg/simplex/tetrahedron/pos.h
@@ -54,7 +54,7 @@ private:
 	int _vi;
 	/// Default Constructor
 public:
-	VTIterator(){}
+  VTIterator() : _vt(0), _vi(-1){}
 	/// Constructor which associates the EdgePos elementet with a face and its edge
 	VTIterator(TetraType  * const tp, int const zp)
 	{