diff --git a/SbzFromCurves.cpp b/SbzFromCurves.cpp
index 10995f8..34cb3f5 100644
--- a/SbzFromCurves.cpp
+++ b/SbzFromCurves.cpp
@@ -709,7 +709,7 @@ GetSurfBezierRuled( const ICurve* pCurve1, const ICurve* pCurve2, int nType, dou
    // se la curva è già una bezier singola la tengo, sennò la converto
    PtrOwner<ICurveComposite> pCC1( CreateCurveComposite()) ;
    if ( pCurve1->GetType() != CRV_BEZIER)
-      pCC1->AddCurve( CurveToBezierCurve( pCurve1, true, false)) ;
+      pCC1->AddCurve( CurveToBezierCurve( pCurve1, 3, false)) ;
    else
       pCC1->AddCurve( pCurve1->Clone()) ;
    if ( IsNull( pCC1)  ||  ! pCC1->IsValid())
@@ -718,7 +718,7 @@ GetSurfBezierRuled( const ICurve* pCurve1, const ICurve* pCurve2, int nType, dou
    // se la curva è già una bezier singola la tengo, sennò la converto
    PtrOwner<ICurveComposite> pCC2( CreateCurveComposite()) ;
    if ( pCurve2->GetType() != CRV_BEZIER)
-      pCC2->AddCurve( CurveToBezierCurve( pCurve2, true, false)) ;
+      pCC2->AddCurve( CurveToBezierCurve( pCurve2, 3, false)) ;
    else
       pCC2->AddCurve( pCurve2->Clone()) ;
    if ( IsNull( pCC2)  ||  ! pCC2->IsValid())