diff --git a/spec/incinerator/default.nix b/spec/incinerator/default.nix
index 5ee06959..bc5c8243 100644
--- a/spec/incinerator/default.nix
+++ b/spec/incinerator/default.nix
@@ -7,8 +7,8 @@
     libvirt.enable = false;
     io.bluetooth = false;
     io.audio = false;
-    fs.type = "btrfs";
-    fs.store = "534f985d-0540-49eb-a2f6-b30ea16f41ad";
+    fs.type = "ext4";
+    fs.store = "7c3459d2-c046-4ef6-8bc6-a8cf97bcade9";
     oci.enable = true;
   };