diff --git a/nix/nixos-module/defaults.nix b/nix/nixos-module/defaults.nix
index 2e28949..508d969 100644
--- a/nix/nixos-module/defaults.nix
+++ b/nix/nixos-module/defaults.nix
@@ -1,4 +1,4 @@
-{ hostName, inputs, pkgs, ... }:
+{ hostName, inputs, lib, pkgs, ... }:
 
 {
   boot.kernelParams = [
@@ -25,6 +25,11 @@
     registry = {
       nixpkgs.flake = inputs.nixpkgs;
     };
+
+    binaryCachePublicKeys = [
+      "nix-serve.hq.c3d2.de:KZRGGnwOYzys6pxgM8jlur36RmkJQ/y8y62e52fj1ps=%"
+    ];
+    binaryCaches = lib.mkBefore [ "https://hydra.hq.c3d2.de" ];
   };
 
   documentation = {