diff --git a/EMkMachMgr.h b/EMkMachMgr.h
index 52e4965..d48ab12 100644
--- a/EMkMachMgr.h
+++ b/EMkMachMgr.h
@@ -246,7 +246,7 @@ class __declspec( novtable) IMachMgr
       virtual bool GetCalcAuxDirFromAngles( double dAngA, double dAngB, Vector3d& vtDir) const = 0 ;
       virtual bool GetNearestAngleInStroke( int nInd, double dAngRef, double& dAng) const = 0 ;
       virtual bool LimitAngleToStroke( int nInd, double& dAng) const = 0 ;
-      virtual bool VerifyOutstroke( double dX, double dY, double dZ, double dAngA, double dAngB, int& nStat) = 0 ;
+      virtual bool VerifyOutstroke( double dX, double dY, double dZ, double dAngA, double dAngB, int& nStat) const = 0 ;
       virtual std::string GetOutstrokeInfo( bool bMM = true) const = 0 ;
      // Machine
       virtual int  GetBaseId( const std::string& sBase) const = 0 ;
@@ -268,7 +268,7 @@ class __declspec( novtable) IMachMgr
       virtual bool UnloadTool( const std::string& sHead, int nExit) = 0 ;
       virtual bool ResetHeadSet( const std::string& sHead) = 0 ;
       virtual bool SetMachineLook( int nFlag) = 0 ;
-      virtual int  GetMachineLook( void) = 0 ;
+      virtual int  GetMachineLook( void) const = 0 ;
 } ;
 
 //-----------------------------------------------------------------------------