diff --git a/EXE_GdbModifyCurve.cpp b/EXE_GdbModifyCurve.cpp
index 3168f5e..ec67214 100644
--- a/EXE_GdbModifyCurve.cpp
+++ b/EXE_GdbModifyCurve.cpp
@@ -208,7 +208,7 @@ ExeApproxCurve( int nId, int nApprType, double dLinTol, double dMaxSegmLen)
      // eliminazione di small Z
       bOk = bOk && pCC->RemoveSmallDefects( 0.5 * dLinTol, ANG_TOL_STD_DEG) ;
    }
-   else {       // con bi-archi
+   else if ( nApprType == APP_ARCS) {       // con bi-archi
       PolyArc PA ;
       double dLinFea = LIN_FEA_STD ;
       double dAngTol = ANG_TOL_STD_DEG ;
@@ -223,6 +223,11 @@ ExeApproxCurve( int nId, int nApprType, double dLinTol, double dMaxSegmLen)
      // merge di archi identici di biarchi
       bOk = bOk && pCC->MergeCurves( 0.5 * dLinTol, ANG_TOL_STD_DEG) ;
    }
+   else if ( nApprType == APP_CUBIC_BEZIER) {
+      PtrOwner<ICurve> pCrv( ApproxCurveWithBezier( pCurve, dLinTol)) ;
+      bOk = bOk && ! IsNull( pCrv) ;
+      bOk = bOk && pCC->AddCurve( pCrv) ;
+   }
   // copio estrusione e spessore
    Vector3d vtExtr ;
    if ( bOk  &&  pCurve->GetExtrusion( vtExtr))