diff --git a/modules/nix-index-db.nix b/modules/nix-index-db.nix
index 6a589e7..80f23eb 100644
--- a/modules/nix-index-db.nix
+++ b/modules/nix-index-db.nix
@@ -1,13 +1,15 @@
 { config, pkgs, lib, ... }:
 
 with lib; {
-  options.elss.nix-index-db-update.enable = mkEnableOption "periodically update the nix-index database";
+  options.elss.nix-index-db-update.enable =
+    mkEnableOption "periodically update the nix-index database";
 
   config =
     let
       cfg = config.elss.nix-index-db-update;
       nix-index-db-update = pkgs.writeShellScript "nix-index-db-update" ''
         set -euo pipefail
+
         filename="index-x86_64-$(${pkgs.coreutils}/bin/uname | ${pkgs.coreutils}/bin/tr A-Z a-z)"
         cd /var/db/nix-index/
         ${pkgs.wget}/bin/wget -q -N https://github.com/Mic92/nix-index-database/releases/latest/download/$filename
@@ -47,9 +49,9 @@ with lib; {
       };
 
       home-manager.users = mapAllUsers (_:
-        {
-          home.file.".cache/nix-index" = "/var/db/nix-index/";
-        }
-      );
+        { config, ... }: {
+          home.file.".cache/nix-index".source =
+            config.lib.file.mkOutOfStoreSymlink "/var/db/nix-index/";
+        });
     };
 }