diff --git a/Makefile b/Makefile
index 22b6cb4..b316333 100644
--- a/Makefile
+++ b/Makefile
@@ -1,11 +1,17 @@
 RELEASE=5.1
 
 # also update pve-kernel-meta.git if either of these change
-KERNEL_VER=4.13.16
+KERNEL_MAJ=4
+KERNEL_MIN=13
+KERNEL_PATCHLEVEL=16
+
 KREL=3
 
 PKGREL=49
 
+KERNEL_MAJMIN=$(KERNEL_MAJ).$(KERNEL_MIN)
+KERNEL_VER=$(KERNEL_MAJMIN).$(KERNEL_PATCHLEVEL)
+
 EXTRAVERSION=-${KREL}-pve
 KVNAME=${KERNEL_VER}${EXTRAVERSION}
 PACKAGE=pve-kernel-${KVNAME}
@@ -33,7 +39,7 @@ endif
 BUILD_DIR=build
 
 KERNEL_SRC=ubuntu-artful
-KERNEL_SRC_SUBMODULE=submodules/ubuntu-artful
+KERNEL_SRC_SUBMODULE=submodules/$(KERNEL_SRC)
 KERNEL_CFG_ORG=config-${KERNEL_VER}.org
 
 E1000EDIR=e1000e-3.3.6
@@ -59,7 +65,7 @@ DIRS=KERNEL_SRC E1000EDIR IGBDIR IXGBEDIR SPLDIR ZFSDIR MODULES
 
 DST_DEB=${PACKAGE}_${KERNEL_VER}-${PKGREL}_${ARCH}.deb
 HDR_DEB=${HDRPACKAGE}_${KERNEL_VER}-${PKGREL}_${ARCH}.deb
-LINUX_TOOLS_DEB=linux-tools-4.13_${KERNEL_VER}-${PKGREL}_${ARCH}.deb
+LINUX_TOOLS_DEB=linux-tools-$(KERNEL_MAJMIN)_${KERNEL_VER}-${PKGREL}_${ARCH}.deb
 
 DEBS=${DST_DEB} ${HDR_DEB} ${LINUX_TOOLS_DEB}
 
@@ -94,6 +100,7 @@ debian.prepared: debian
 	echo "git clone git://git.proxmox.com/git/pve-kernel.git\\ngit checkout ${GITVERSION}" > ${BUILD_DIR}/debian/SOURCE
 	@$(foreach dir, ${DIRS},echo "${dir}=${${dir}}" >> ${BUILD_DIR}/debian/rules.d/env.mk;)
 	echo "KVNAME=${KVNAME}" >> ${BUILD_DIR}/debian/rules.d/env.mk
+	echo "KERNEL_MAJMIN=${KERNEL_MAJMIN}" >> ${BUILD_DIR}/debian/rules.d/env.mk
 	cd ${BUILD_DIR}; debian/rules debian/control
 	touch $@
 
diff --git a/debian/rules b/debian/rules
index 55b20fc..39f5cb5 100755
--- a/debian/rules
+++ b/debian/rules
@@ -15,7 +15,7 @@ CHANGELOG_DATE:=$(shell dpkg-parsechangelog -SDate)
 
 PVE_KERNEL_PKG=pve-kernel-${KVNAME}
 PVE_HEADER_PKG=pve-headers-${KVNAME}
-LINUX_TOOLS_PKG=linux-tools-4.13
+LINUX_TOOLS_PKG=linux-tools-${KERNEL_MAJMIN}
 
 # TODO: split for archs, move to files?
 PVE_CONFIG_OPTS= \
@@ -137,7 +137,7 @@ binary: install
 	rm -rf debian/${LINUX_TOOLS_PKG}
 	mkdir -p debian/${LINUX_TOOLS_PKG}/usr/bin
 	mkdir -p debian/${LINUX_TOOLS_PKG}/usr/share/man/man1
-	install -m 755 ${BUILD_DIR}/${KERNEL_SRC}/tools/perf/perf debian/${LINUX_TOOLS_PKG}/usr/bin/perf_4.13
+	install -m 755 ${BUILD_DIR}/${KERNEL_SRC}/tools/perf/perf debian/${LINUX_TOOLS_PKG}/usr/bin/perf_$(KERNEL_MAJMIN)
 	install -m644 ${BUILD_DIR}/${KERNEL_SRC}/tools/perf/Documentation/*.1 debian/${LINUX_TOOLS_PKG}/usr/share/man/man1
 	touch $@