diff --git a/arch-template.json b/arch-template.json
index cce60cb..a455a23 100644
--- a/arch-template.json
+++ b/arch-template.json
@@ -1,7 +1,7 @@
 {
     "variables": {
-        "iso_url": "https://mirrors.kernel.org/archlinux/iso/2016.07.01/archlinux-2016.07.01-dual.iso",
-        "iso_checksum_url": "https://mirrors.kernel.org/archlinux/iso/2016.07.01/sha1sums.txt",
+        "iso_url": "https://mirrors.kernel.org/archlinux/iso/2016.08.01/archlinux-2016.08.01-dual.iso",
+        "iso_checksum_url": "https://mirrors.kernel.org/archlinux/iso/2016.08.01/sha1sums.txt",
         "iso_checksum_type": "sha1",
         "ssh_timeout": "20m"
     },
diff --git a/srv/install-base.sh b/srv/install-base.sh
index d64a5a6..a754659 100755
--- a/srv/install-base.sh
+++ b/srv/install-base.sh
@@ -25,7 +25,7 @@ echo "==> setting ${DISK} bootable"
 /usr/bin/sgdisk ${DISK} --attributes=1:set:2
 
 echo '==> creating /root filesystem (ext4)'
-/usr/bin/mkfs.ext4 -F -m 0 -q -L root ${ROOT_PARTITION}
+/usr/bin/mkfs.ext4 -O ^64bit -F -m 0 -q -L root ${ROOT_PARTITION}
 
 echo "==> mounting ${ROOT_PARTITION} to ${TARGET_DIR}"
 /usr/bin/mount -o noatime,errors=remount-ro ${ROOT_PARTITION} ${TARGET_DIR}