diff --git a/Makefile b/Makefile
index f07dce1..69c7247 100644
--- a/Makefile
+++ b/Makefile
@@ -32,27 +32,31 @@ linux-rock64-package-$(RELEASE_NAME).deb: package package/rtk_bt/rtk_hciattach/r
 	pxz -f -3 $<
 
 xenial-minimal-rock64-$(RELEASE_NAME)-$(RELEASE)-$(BUILD_ARCH)-system.img: linux-rock64-package-$(RELEASE_NAME).deb
-	sudo bash export BUILD_ARCH=$(BUILD_ARCH) ./build-system-image.sh \
+	sudo bash export ./build-system-image.sh \
 		$(shell readlink -f $@) \
 		$(shell readlink -f $<) \
 		"" \
 		$(shell readlink -f linux-rock64-package-$(RELEASE_NAME).deb) \
 		xenial \
 		rock64 \
-		minimal
+		minimal \
+		"" \
+		"${BUILD_ARCH}"
 
 xenial-minimal-rock64-$(RELEASE_NAME)-$(RELEASE)-$(BUILD_ARCH)-system.img: linux-rock64-package-$(RELEASE_NAME).deb
-	cd rootfs/ && sudo export BUILD_ARCH=$(BUILD_ARCH) bash ./build-system-image.sh \
+	cd rootfs/ && sudo bash ./build-system-image.sh \
 		$(shell readlink -f $@) \
 		"" \
 		"" \
 		$(shell readlink -f linux-rock64-package-$(RELEASE_NAME).deb) \
 		xenial \
 		rock64 \
-		minimal
+		minimal \
+		"" \
+		"${BUILD_ARCH}"
 
 xenial-mate-rock64-$(RELEASE_NAME)-$(RELEASE)-$(BUILD_ARCH)-system.img: linux-rock64-package-$(RELEASE_NAME).deb
-	cd rootfs/ && sudo export BUILD_ARCH=$(BUILD_ARCH) bash ./build-system-image.sh \
+	cd rootfs/ && sudo bash ./build-system-image.sh \
 		$(shell readlink -f $@) \
 		"" \
 		"" \
@@ -60,7 +64,8 @@ xenial-mate-rock64-$(RELEASE_NAME)-$(RELEASE)-$(BUILD_ARCH)-system.img: linux-ro
 		xenial \
 		rock64 \
 		mate \
-		7300
+		7300 \
+		"${BUILD_ARCH}"
 
 xenial-i3-rock64-$(RELEASE_NAME)-$(RELEASE)-$(BUILD_ARCH)-system.img: linux-rock64-package-$(RELEASE_NAME).deb
 	cd rootfs/ && sudo bash ./build-system-image.sh \
@@ -70,7 +75,9 @@ xenial-i3-rock64-$(RELEASE_NAME)-$(RELEASE)-$(BUILD_ARCH)-system.img: linux-rock
 		$(shell readlink -f linux-rock64-package-$(RELEASE_NAME).deb) \
 		xenial \
 		rock64 \
-		i3
+		i3 \
+		"" \
+		"${BUILD_ARCH}"
 
 stretch-i3-rock64-$(RELEASE_NAME)-$(RELEASE)-$(BUILD_ARCH)-system.img: linux-rock64-package-$(RELEASE_NAME).deb
 	cd rootfs/ && sudo export BUILD_ARCH=$(BUILD_ARCH) bash rootfs/build-system-image.sh \
@@ -80,7 +87,9 @@ stretch-i3-rock64-$(RELEASE_NAME)-$(RELEASE)-$(BUILD_ARCH)-system.img: linux-roc
 		$(shell readlink -f linux-rock64-package-$(RELEASE_NAME).deb) \
 		stretch \
 		rock64 \
-		i3
+		i3 \
+		"" \
+		"${BUILD_ARCH}"
 
 out/kernel/Image out/kernel/rk3328-rock64.dtb: kernel/arch/arm64/configs/rockchip_linux_defconfig
 	build/mk-kernel.sh rk3328-rock64
diff --git a/rootfs/build-system-image.sh b/rootfs/build-system-image.sh
index 35bba22..011985f 100755
--- a/rootfs/build-system-image.sh
+++ b/rootfs/build-system-image.sh
@@ -12,13 +12,18 @@ DISTRO="$5"
 MODEL="$6"
 VARIANT="$7"
 SIZE="${8:-3650}"
+BUILD_ARCH="$9"
 if [[ -z "$MODEL" ]]; then
   MODEL="rock64"
 fi
+if [[ -z "$BUILD_ARCH" ]]; then
+  BUILD_ARCH="arm64"
+fi
 export MODEL
+export BUILD_ARCH
 
 if [ -z "$VARIANT" ]; then
-	echo "Usage: $0 <result.img> <simpleimage.img.xz> <kernel.tar.xz> <package.deb> [distro] [model] [variant: mate, i3, empty] [size (MiB)]"
+	echo "Usage: $0 <result.img> <simpleimage.img.xz> <kernel.tar.xz> <package.deb> [distro] [model] [variant: mate, i3, empty] [size (MiB)] [build_arch]"
 	exit 1
 fi