diff --git a/CalcPocketing.cpp b/CalcPocketing.cpp
index b457daf..b01d793 100644
--- a/CalcPocketing.cpp
+++ b/CalcPocketing.cpp
@@ -1143,9 +1143,13 @@ AdjustOpenEdge( const ICurveComposite* pCrvCompo, const ICRVCOMPOPOVECTOR& vCrvI
 
   // definisco la regione di incidenza
    PtrOwner<ISurfFlatRegion> pSfrInc( CreateSurfFlatRegion()) ;
-   if ( IsNull( pSfrInc)  ||
-        ! CreateSurfFrIncidence( pCrvBorder, PockParams, vtTanS, vtTanE, dRad + 75 * EPS_SMALL, pSfrInc))
+   if ( IsNull( pSfrInc))
       return false ;
+   if ( ! CreateSurfFrIncidence( pCrvBorder, PockParams, vtTanS, vtTanE, dRad + 75 * EPS_SMALL, pSfrInc)) {
+      pSfrInc.Set( GetSurfFlatRegionFromFatCurve( CloneCurveComposite( pCrvBorder), dRad + 75 * EPS_SMALL, false, false)) ;
+      if ( IsNull( pSfrInc)  ||  ! pSfrInc->IsValid())
+         return false ;
+   }
 
   // creo un vettore con tutte le curve che potrebbero cadere, in parte, nella regione di incidenza
    ICRVCOMPOPOVECTOR vCrvToCheck ;