diff --git a/nixos/module/ephemeral.nix b/nixos/module/ephemeral.nix
index d2bc74d..2d74fd8 100644
--- a/nixos/module/ephemeral.nix
+++ b/nixos/module/ephemeral.nix
@@ -118,7 +118,7 @@ let
       options = [ "nodev" "noexec" "nosuid" ];
     };
   } |> lib.mapAttrs (name: subvol: subvol // {
-    extraOptions = [ "noatime" "compress=zstd" ];
+    extraOptions = [ "noatime" "autodefrag" "compress=zstd" ];
   });
 in {
   options = {