diff --git a/modules/nixos/hardware/fs.nix b/modules/nixos/hardware/fs.nix
--- a/modules/nixos/hardware/fs.nix
+++ b/modules/nixos/hardware/fs.nix
@@ -1,26 +1,17 @@
-{ lib, config, ... }:
-let
-  inherit (lib) mkIf mkMerge filterAttrs;
-
-  hasBtrfs = (filterAttrs (_: v: v.fsType == "btrfs") config.fileSystems) != { };
-in
+{ config, ... }:
 {
-  config = mkMerge [
-    {
-      # discard blocks that are not in use by the filesystem, good for SSDs health
-      services.fstrim = {
-        enable = true;
-        interval = "weekly";
-      };
-    }
+  # discard blocks that are not in use by the filesystem, good for SSDs health
+  services = {
+    fstrim = {
+      enable = true;
+      interval = "weekly";
+    };
 
     # clean btrfs devices
-    (mkIf hasBtrfs {
-      services.btrfs.autoScrub = {
-        enable = true;
-        interval = "weekly";
-        fileSystems = [ "/" ];
-      };
-    })
-  ];
+    btrfs.autoScrub = {
+      enable = config.boot.supportedFilesystems.btrfs or false;
+      interval = "weekly";
+      fileSystems = [ "/" ];
+    };
+  };
 }