diff --git a/EGkCurveAux.h b/EGkCurveAux.h
index fef0585..2f21d6e 100644
--- a/EGkCurveAux.h
+++ b/EGkCurveAux.h
@@ -64,7 +64,7 @@ EGK_EXPORT ICurve* CompositeToBezierCurve( const ICurveComposite* pCrvCompo, int
 
 //----------------------------------------------------------------------------
 //! Trasforma una curva bezier in una nuova curva di Bezier semplice o composta della razionalità e  grado desiderato ( minimo 3)
-EGK_EXPORT ICurve* EditBezierCurve( const ICurveBezier* pCrvBezier, int nDeg = 3, bool bMakeRatOrNot = true) ;
+EGK_EXPORT ICurve* EditBezierCurve( const ICurveBezier* pCrvBezier, int nDeg = 3, bool bMakeRatOrNot = true, double dTol = 10 * EPS_SMALL) ;
 
 //----------------------------------------------------------------------------
 //! Approssima una bezier con una serie di bezier cubiche
diff --git a/EGkCurveBezier.h b/EGkCurveBezier.h
index de4bae2..954bc0c 100644
--- a/EGkCurveBezier.h
+++ b/EGkCurveBezier.h
@@ -40,7 +40,7 @@ class __declspec( novtable) ICurveBezier : public ICurve
       virtual int  GetSingularParam( double& dPar) const = 0 ;
       virtual bool MakeRational( void) = 0 ;
       virtual bool MakeRationalStandardForm( void) = 0 ;
-      virtual bool MakeNonRational( double dTol, double& dErr) = 0 ;
+      virtual bool MakeNonRational( double dTol) = 0 ;
 } ;
 
 //-----------------------------------------------------------------------------