diff --git a/Pocketing.cpp b/Pocketing.cpp
index 8213114..ff25a95 100644
--- a/Pocketing.cpp
+++ b/Pocketing.cpp
@@ -3901,8 +3901,8 @@ Pocketing::CalcSpiral( const ICurveComposite* pCompo, int nReg, bool bSplitArcs,
          CalcCurveLimitOffset( *pCompo, dMaxOffs) ;
       else
          CalcCurveLimitOffset( *pOffs, dMaxOffs) ;
-      if ( abs( dMaxOffs - dOffs) < EPS_SMALL)
-         dOffs -= EPS_SMALL ;
+      if ( dOffs > dMaxOffs - 10 * EPS_ZERO  &&  dOffs < dMaxOffs + EPS_SMALL)
+         dOffs = dMaxOffs - 10 * EPS_ZERO ;
 
      // calcolo
       OffsetCurve OffsCrv ;