diff --git a/system/nix-conf.nix b/system/nix-conf.nix
index be30014..9801523 100644
--- a/system/nix-conf.nix
+++ b/system/nix-conf.nix
@@ -1,4 +1,10 @@
-{ ... }: {
+{ config, ... }: {
+  services = {
+    nix-serve = {
+      enable = true;
+      secretKeyFile = config.age.secrets.cache-key.path;
+    };
+  };
   nix = {
     buildMachines = [
       {