diff --git a/Makefile b/Makefile
index 5b13490..183f5f0 100644
--- a/Makefile
+++ b/Makefile
@@ -4,26 +4,28 @@ MKISOFS = genisoimage
 ISO = $(HOS).iso
 QEMU = qemu-system-x86_64
 
-.PHONY: kernel clean qemu iso
-
 # default target: build the kernel and ISO image
 all: kernel iso
 
 # build the kernel
+.PHONY: kernel
 kernel:
 	make -C kernel
 
 # build the ISO image
-iso: $(ISO)
+.PHONY: iso
+iso: $(ISO) kernel
 
 $(ISO): kernel
 	cp kernel/$(HOS) iso/boot
 	$(MKISOFS) -R -b boot/grub/stage2_eltorito -no-emul-boot \
 		-boot-load-size 4 -boot-info-table -o $(ISO) iso
 
+.PHONY: qemu
+qemu: iso
+	$(QEMU) -cdrom $(ISO) -boot d -m 384 -localtime
+
+.PHONY: clean
 clean:
 	make -C kernel clean
 	-rm -f $(ISO) iso/boot/$(HOS)
-
-qemu: $(ISO)
-	$(QEMU) -cdrom $(ISO) -boot d -m 384 -localtime