diff --git a/debian/rules.real b/debian/rules.real
index 1052e9c98..545e4d947 100644
--- a/debian/rules.real
+++ b/debian/rules.real
@@ -15,7 +15,6 @@ endif
 MAINTAINER := $(shell sed -ne 's,^Maintainer: .[^<]*<\([^>]*\)>,\1,p' debian/control)
 DISTRIBUTION := $(shell dpkg-parsechangelog | sed -ne 's,^Distribution: ,,p')
 SOURCE_DATE := $(shell dpkg-parsechangelog | sed -ne 's,^Date: ,,p')
-SOURCE_DATE_UTC_822 := $(shell date -u -d '$(SOURCE_DATE)' -R)
 SOURCE_DATE_UTC_ISO := $(shell date -u -d '$(SOURCE_DATE)' +%Y-%m-%d)
 
 DISTRIBUTOR := $(shell lsb_release -is 2>/dev/null)
@@ -40,7 +39,7 @@ include debian/rules.defs
 stamp = [ -d $(dir $@) ] || mkdir $(dir $@); touch $@
 
 setup_env := env -u ABINAME -u ARCH -u FEATURESET -u FLAVOUR -u VERSION -u LOCALVERSION
-setup_env += DISTRIBUTION_OFFICIAL_BUILD=1 DISTRIBUTOR="$(DISTRIBUTOR)" DISTRIBUTION_VERSION="$(SOURCEVERSION)" KBUILD_BUILD_TIMESTAMP="$(SOURCE_DATE_UTC_822)" KBUILD_BUILD_VERSION_TIMESTAMP="$(DISTRIBUTOR) $(SOURCEVERSION) ($(SOURCE_DATE_UTC_ISO))" KBUILD_BUILD_USER="$(word 1,$(subst @, ,$(MAINTAINER)))" KBUILD_BUILD_HOST="$(word 2,$(subst @, ,$(MAINTAINER)))"
+setup_env += DISTRIBUTION_OFFICIAL_BUILD=1 DISTRIBUTOR="$(DISTRIBUTOR)" DISTRIBUTION_VERSION="$(SOURCEVERSION)" KBUILD_BUILD_TIMESTAMP="$(SOURCE_DATE)" KBUILD_BUILD_VERSION_TIMESTAMP="$(DISTRIBUTOR) $(SOURCEVERSION) ($(SOURCE_DATE_UTC_ISO))" KBUILD_BUILD_USER="$(word 1,$(subst @, ,$(MAINTAINER)))" KBUILD_BUILD_HOST="$(word 2,$(subst @, ,$(MAINTAINER)))"
 
 MAKE_CLEAN = $(setup_env) $(MAKE)
 MAKE_SELF := $(MAKE) -f debian/rules.real $(MAKEOVERRIDES)