diff --git a/debian/rules b/debian/rules
index 654636195..f5476e14b 100755
--- a/debian/rules
+++ b/debian/rules
@@ -1,10 +1,7 @@
 #!/usr/bin/make -f
 
 SHELL    := sh -e
-SOURCE   := $(shell dpkg-parsechangelog | sed -ne 's,^Source: *\(.*\)$$,\1,p')
-VERSION_DEBIAN := $(shell dpkg-parsechangelog | sed -ne 's,^Version: *\(.*\)$$,\1,p')
-VERSION  := $(shell echo "$(VERSION_DEBIAN)" | sed -e 's,-[^-]*$$,,')
-VERSION_DEBIAN_BINNMU := $(shell echo "$(VERSION_DEBIAN)" | sed -ne 's,.*\+b\(.*\)$$,\1,p')
+VERSION_DEBIAN_BINNMU := $(shell echo "$(DEB_VERSION)" | sed -ne 's,.*\+b\(.*\)$$,\1,p')
 
 include debian/rules.defs
 
@@ -21,8 +18,8 @@ build-indep: debian/control
 $(STAMPS_DIR):
 	@[ -d $@ ] || mkdir $@
 
-DIR_ORIG = ../orig/$(SOURCE)-$(VERSION)
-TAR_ORIG_NAME = $(SOURCE)_$(VERSION).orig.tar.xz
+DIR_ORIG = ../orig/$(DEB_SOURCE)-$(DEB_VERSION_UPSTREAM)
+TAR_ORIG_NAME = $(DEB_SOURCE)_$(DEB_VERSION_UPSTREAM).orig.tar.xz
 TAR_ORIG = $(firstword $(wildcard ../$(TAR_ORIG_NAME)) $(wildcard ../orig/$(TAR_ORIG_NAME)))
 
 orig: $(DIR_ORIG)
diff --git a/debian/rules.real b/debian/rules.real
index d173b6f0c..ee176abd4 100644
--- a/debian/rules.real
+++ b/debian/rules.real
@@ -2,10 +2,6 @@ export DH_OPTIONS
 
 include debian/rules.defs
 
-# VERSION_DEBIAN is the package source version; VERSION_DEBIAN_FULL
-# includes any binNMU part.
-VERSION_DEBIAN_FULL := $(shell dpkg-parsechangelog | sed -ne 's,^Version: *\(.*\)$$,\1,p')
-
 binary-arch: install-kbuild install-usbip install-hyperv-daemons
 ifneq ($(filter alpha amd64 arm64 armel armhf hppa i386 mips mips64 mips64el mipsel powerpc powerpcspe ppc64 ppc64el s390 s390x sh4 sparc sparc64 x32,$(DEB_BUILD_ARCH)),)
   binary-arch: install-tools
@@ -76,8 +72,8 @@ install-usbip: $(STAMPS_DIR)/build
 	dh_fixperms
 	dh_installdeb
 	dh_shlibdeps
-	test -n "$(VERSION)" -a -n "$(VERSION_DEBIAN_FULL)"
-	dh_gencontrol -- -v$(VERSION)+$(VERSION_DEBIAN_FULL)
+	test -n "$(VERSION)" -a -n "$(DEB_VERSION)"
+	dh_gencontrol -- -v$(VERSION)+$(DEB_VERSION)
 	dh_md5sums
 	dh_builddeb