diff --git a/modules/nix-settings.nix b/modules/nix-settings.nix
index 31334f6..bf9af98 100644
--- a/modules/nix-settings.nix
+++ b/modules/nix-settings.nix
@@ -25,6 +25,7 @@ in {
   };
   config = {
     nix = {
+      optimise.automatic = true;
       settings = {
         trusted-users = [
           "root"