diff --git a/nixos/configuration.nix b/nixos/configuration.nix
index 0b2ff12..834add6 100755
--- a/nixos/configuration.nix
+++ b/nixos/configuration.nix
@@ -10,6 +10,10 @@
 }:
 {
   nix = {
+    optimise = {
+      automatic = true;
+      dates = [ "03:25" ];
+    };
     settings = {
       experimental-features = [
         "nix-command"