diff --git a/EGkCurveAux.h b/EGkCurveAux.h
index cb0cceb..d8490a8 100644
--- a/EGkCurveAux.h
+++ b/EGkCurveAux.h
@@ -171,7 +171,7 @@ EGK_EXPORT void ResetCurveVoronoi( const ICurve& crvC) ;
 
 //----------------------------------------------------------------------------
 //! fa il join delle curve passate in input
-EGK_EXPORT bool GetChainedCurves( ICRVCOMPOPOVECTOR& vCrv, double dChainTol = 5 * EPS_SMALL, bool bAllowInvert = false) ;
+EGK_EXPORT bool GetChainedCurves( ICRVCOMPOPOVECTOR& vCrv, double dChainTol = 5 * EPS_SMALL, bool bAllowInvert = false, bool bHaltOnFork = false) ;
 
 //----------------------------------------------------------------------------
 //! dato un punto su una curva trova il corrispondente sulla seconda curva