diff --git a/Makefile b/Makefile
index 2b90815..00bdacf 100644
--- a/Makefile
+++ b/Makefile
@@ -1,5 +1,6 @@
 PROGRAMS = hello.com
-DISTFILES = @rdos.com $(PROGRAMS)
+KERNEL = @rdos.com
+DISTFILES = $(KERNEL) $(PROGRAMS)
 ROMS =
 
 QEMU = qemu-system-i386
@@ -62,13 +63,12 @@ fat6.bs: boot/fat.asm
 fd%.img: $(DISTFILES) $(SYS)
 	mformat -C -i $@ -f $* -c 2 -v "$(LABEL)" ::
 	mcopy      -i $@ $(DISTFILES) ::
-	$(SYS)        $@ @rdos.com
+	$(SYS)        $@ $(KERNEL)
 
-hdd.img: mbr.bs @rdos.com fd1440.img
+hdd.img: mbr.bs $(KERNEL) fd1440.img
 	dd if=mbr.bs bs=512 count=1 of=$@
-	dd if=@rdos.com bs=512 seek=1 of=$@
+	dd if=$(KERNEL) bs=512 seek=1 of=$@
 	dd if=fd1440.img bs=512 seek=63 of=$@
-	dd if=/dev/zero bs=512 seek=$$(( 63 * 23 )) count=63 of=$@
 
 clean:
 	rm -f *.com *.bs *.0 *.lst *.img *.bin *.rom