diff --git a/machines/moby/default.nix b/machines/moby/default.nix
index 0cc503a4..08d63657 100644
--- a/machines/moby/default.nix
+++ b/machines/moby/default.nix
@@ -32,6 +32,7 @@
   ];
 
   sane.nixcache.enable = true;
+  sane.impermanence.enable = true;  # XXX experimental
   sane.gui.phosh.enable = true;
   boot.loader.grub.enable = false;
   mobile.bootloader.enable = false;