diff --git a/debian/rules b/debian/rules
index 94a88e7..ce8e42f 100755
--- a/debian/rules
+++ b/debian/rules
@@ -12,6 +12,7 @@ include debian/rules.d/env.mk
 include debian/rules.d/${DEB_BUILD_ARCH}.mk
 
 CHANGELOG_DATE:=$(shell dpkg-parsechangelog -SDate)
+CHANGELOG_DATE_UTC_ISO := $(shell date -u -d '$(SOURCE_DATE)' +%Y-%m-%dT%H:%MZ)
 
 PVE_KERNEL_PKG=pve-kernel-${KVNAME}
 PVE_DEBUG_KERNEL_PKG=pve-kernel-${KVNAME}-dbgsym
@@ -126,7 +127,7 @@ binary: install
 	touch $@
 
 .compile_mark: .config_mark
-	${MAKE} -C ${KERNEL_SRC} KBUILD_BUILD_VERSION_TIMESTAMP="PVE ${DEB_VERSION} (${CHANGELOG_DATE})"
+	${MAKE} -C ${KERNEL_SRC} KBUILD_BUILD_VERSION_TIMESTAMP="PVE ${DEB_VERSION} (${CHANGELOG_DATE_UTC_ISO})"
 	touch $@
 
 .install_mark: .compile_mark .modules_compile_mark