diff --git a/image.yaml b/image.yaml
index 5969ab3b..ac9b8145 100644
--- a/image.yaml
+++ b/image.yaml
@@ -11,3 +11,5 @@ squashfs-compression: gzip
 # Disable networking by default on firstboot. We can drop this once cosa stops
 # defaulting to `ip=dhcp,dhcp6 rd.neednet=1` when it doesn't see this key.
 ignition-network-kcmdline: []
+
+ostree-format: "oci"