diff --git a/vcg/simplex/face/distance.h b/vcg/simplex/face/distance.h
index 6479535b..e49cac8b 100644
--- a/vcg/simplex/face/distance.h
+++ b/vcg/simplex/face/distance.h
@@ -105,7 +105,7 @@ namespace vcg {
                 //const ScalarType EPSILON = 0.00000001;
 		ScalarType b,b0,b1,b2;
 			// Calcolo distanza punto piano
-		ScalarType d = DistancePlanePoint( f.cPlane(), q );
+		ScalarType d = SignedDistancePlanePoint( f.cPlane(), q );
 		if( d>dist || d<-dist )			// Risultato peggiore: niente di fatto
 			return false;