diff --git a/f-coreos.bu b/f-coreos.bu
index 411bc66..bbcbab4 100644
--- a/f-coreos.bu
+++ b/f-coreos.bu
@@ -42,7 +42,7 @@ storage:
   filesystems:
     - device: /dev/disk/by-partlabel/root
       wipe_filesystem: true
-      format: btrfs
+      format: xfs
       label: root
 
   files: