diff --git a/Makefile b/Makefile
index 5118b4a..e99311c 100644
--- a/Makefile
+++ b/Makefile
@@ -3,42 +3,40 @@ include /usr/share/dpkg/pkg-info.mk
 PACKAGE=ifupdown2
 
 SRCDIR=ifupdown2
-BUILDDIR=${SRCDIR}-${DEB_VERSION_UPSTREAM}
+BUILDDIR=$(SRCDIR)-$(DEB_VERSION_UPSTREAM)
 
 GITVERSION:=$(shell git rev-parse HEAD)
 
-DEB=${PACKAGE}_${DEB_VERSION_UPSTREAM_REVISION}_all.deb
+DEB=$(PACKAGE)_$(DEB_VERSION_UPSTREAM_REVISION)_all.deb
 
-all: ${DEB}
-	@echo ${DEB}
+all: $(DEB)
+	@echo $(DEB)
 
 .PHONY: submodule
 submodule:
-	test -f "${SRCDIR}/debian/changelog" || git submodule update --init
+	test -f "$(SRCDIR)/debian/changelog" || git submodule update --init
 
-buildir: ${BUILDDIR}
-${BUILDDIR}: submodule
+buildir: $(BUILDDIR)
+$(BUILDDIR): submodule
 	rm -rf $(BUILDDIR)
 	mkdir $(BUILDDIR)
 	cp -a $(SRCDIR)/* $(BUILDDIR)/
 	cp -R debian/* $(BUILDDIR)/debian/
 
 .PHONY: deb
-deb: ${DEB}
-${DEB}: ${BUILDDIR}
-	cd ${BUILDDIR}; dpkg-buildpackage -rfakeroot -b -uc -us
+deb: $(DEB)
+$(DEB): $(BUILDDIR)
+	cd $(BUILDDIR); dpkg-buildpackage -rfakeroot -b -uc -us
 
 .PHONY: upload
-upload: ${DEB}
-	tar cf - ${DEB} | ssh -X repoman@repo.proxmox.com -- upload --product pve,pmg,pbs --dist bullseye
+upload: $(DEB)
+	tar cf - $(DEB) | ssh -X repoman@repo.proxmox.com -- upload --product pve,pmg,pbs --dist bullseye
 
-.PHONY: distclean
+.PHONY: distclean clean
 distclean: clean
-
-.PHONY: clean
 clean:
-	rm -rf ${PACKAGE}-*/ *.deb *.changes *.dsc *.buildinfo
+	rm -rf $(PACKAGE)-*/ *.deb *.changes *.dsc *.buildinfo
 
 .PHONY: dinstall
 dinstall: deb
-	dpkg -i ${DEB}
+	dpkg -i $(DEB)