diff --git a/spec/chireiden/default.nix b/spec/chireiden/default.nix
index 4d1c34d9..7fa774e4 100644
--- a/spec/chireiden/default.nix
+++ b/spec/chireiden/default.nix
@@ -4,6 +4,10 @@
     fs.esp.uuid = "32A5-6257";
     fs.type = "xfs";
     fs.store = "c0408dd5-dfc1-42e3-b925-2f32407d320a";
+    fs.extPersist.enable = true;
+    fs.extPersist.device = "/dev/disk/by-uuid/af2b8ec5-62d8-4b14-8ba8-083cc4fb33f4";
+    fs.extPersist.fsType = "btrfs";
+    fs.extPersist.options = [ "noatime" "compress=zstd" ];
     fs.cryptsetup.enable = true;
     fs.cryptsetup.uuids.nix = "3905f87f-7b11-49ef-8ddf-f4202c555ffd";
     fs.cryptsetup.uuids.persist = "b2322f01-1c44-433f-a995-4ddce5845cf9";