diff --git a/labsw/mech/Makefile b/labsw/mech/Makefile
index 1e78dae..204c03e 100644
--- a/labsw/mech/Makefile
+++ b/labsw/mech/Makefile
@@ -19,7 +19,7 @@ logo.gp:	front.fpd
 
 mill.rml mill.gp: front.gp logo.gp
 		./doit $(BOARD) CLEARANCE=3mm || \
-		  { rm -rf $@; exit 1; }
+		  { rm -f $@; exit 1; }
 
 mill:		mill.rml
 		PORT=/dev/ttyUSB0 $(SPOOL) mill.rml