diff --git a/EGkCurveLocal.h b/EGkCurveLocal.h
index 18e71a6..84143db 100644
--- a/EGkCurveLocal.h
+++ b/EGkCurveLocal.h
@@ -78,8 +78,8 @@ class CurveLocal
          { return m_pCrv ; }
 
    private :
-      CurveLocal& operator =( const CurveLocal& other) ;    // intenzionalmente senza implementazione 
-      CurveLocal& operator =( CurveLocal&& other) ;         // intenzionalmente senza implementazione 
+      CurveLocal& operator =( const CurveLocal& other) = delete ;
+      CurveLocal& operator =( CurveLocal&& other) = delete ;
 
    private :
       const ICurve* m_pCrv ;
diff --git a/EGkSurfLocal.h b/EGkSurfLocal.h
index 3830876..093f6fe 100644
--- a/EGkSurfLocal.h
+++ b/EGkSurfLocal.h
@@ -78,8 +78,8 @@ class SurfLocal
          { return m_pSrf ; }
 
    private :
-      SurfLocal& operator =( const SurfLocal& other) ;    // intenzionalmente senza implementazione 
-      SurfLocal& operator =( SurfLocal&& other) ;         // intenzionalmente senza implementazione 
+      SurfLocal& operator =( const SurfLocal& other) = delete ;
+      SurfLocal& operator =( SurfLocal&& other) = delete ;
 
    private :
       const ISurf* m_pSrf ;