diff --git a/EMkMachiningConst.h b/EMkMachiningConst.h
index 135c2c5..8ce6696 100644
--- a/EMkMachiningConst.h
+++ b/EMkMachiningConst.h
@@ -137,6 +137,7 @@ enum MpaType { MPA_NONE =                         0,
                MPA_PROBINGMINDIST =  ( MPA_DOU + 43),      // per taglio ad acqua
                MPA_PROBINGMAXDIST =  ( MPA_DOU + 44),      // per taglio ad acqua
                MPA_CORNERSLOWLEN =   ( MPA_DOU + 45),      // per taglio ad acqua
+               MPA_THICKREF =        ( MPA_DOU + 46),      // per taglio ad acqua
                MPA_NAME =            ( MPA_STR +  0),
                MPA_TOOL =            ( MPA_STR +  1),
                MPA_DEPTH_STR =       ( MPA_STR +  2),