diff --git a/drivers/ramdisk/Makefile b/drivers/ramdisk/Makefile
index dcc6fba72..751d4879b 100644
--- a/drivers/ramdisk/Makefile
+++ b/drivers/ramdisk/Makefile
@@ -12,14 +12,12 @@ EXTRA=system.conf passwd rs.single
 
 CPPFLAGS+= -I${MINIXSRCDIR}/servers -I${MINIXSRCDIR}
 MAKEDEV=/usr/bin/MAKEDEV
+CLEANFILES += $(PROGRAMS) $(EXTRA) bintoc image image.c t proto.gen
 
 install: all
 
 all:	image.c
 
-clean:
-	rm -rf $(PROGRAMS) $(EXTRA) bintoc image image.c t proto.gen
-
 image.c:	bintoc image
 	./bintoc -o $@ image
 
diff --git a/kernel/Makefile b/kernel/Makefile
index bde3be848..12eef69e3 100644
--- a/kernel/Makefile
+++ b/kernel/Makefile
@@ -42,6 +42,8 @@ MAN=
 
 debug.d: extracted-errno.h extracted-mfield.h extracted-mtype.h
 
+CLEANFILES+=extracted-errno.h extracted-mfield.h extracted-mtype.h
+
 extracted-errno.h: extract-errno.sh ../include/errno.h
 	${_MKTARGET_CREATE}
 	cd ${.CURDIR} ; sh extract-errno.sh > ${.OBJDIR}/extracted-errno.h