diff --git a/SurfFinishing.cpp b/SurfFinishing.cpp
index d3f5649..2280eb1 100644
--- a/SurfFinishing.cpp
+++ b/SurfFinishing.cpp
@@ -1672,6 +1672,13 @@ SurfFinishing::CalcZigZag( const ICurveComposite* pOffs,
          nJ = -1 ;
       }
    }
+
+  // se richiesta percorrenza invertita
+   if ( m_Params.m_bInvert) {
+      for ( auto& pCompo : vpCrvs)
+         pCompo->Invert() ;
+   }
+
    return true ;
 }