diff --git a/labsw/mech/Makefile b/labsw/mech/Makefile
index b995df2..59cdcdf 100644
--- a/labsw/mech/Makefile
+++ b/labsw/mech/Makefile
@@ -14,7 +14,8 @@ logo.gp:	front.fpd
 		  { rm -f $@; exit 1; }
 
 mill.rml mill.gp: front.gp logo.gp
-		./doit BOARD_Z=1.6mm CLEARANCE=3mm || { rm -rf $@; exit 1; }
+		./doit BOARD_Z=1.6mm ENGRAVE_Z=0.5mm CLEARANCE=3mm || \
+		  { rm -rf $@; exit 1; }
 
 mill:		mill.rml
 		PORT=/dev/ttyUSB0 $(SPOOL) mill.rml