diff --git a/modules/system.nix b/modules/system.nix
index dcdb863..ba78ec5 100644
--- a/modules/system.nix
+++ b/modules/system.nix
@@ -43,7 +43,10 @@ in {
       };
     };
 
-    nix.settings.experimental-features = [ "nix-command" "flakes" ];
+    nix.settings = {
+      experimental-features = [ "nix-command" "flakes" ];
+      auto-optimise-store = true;
+    };
     nixpkgs.overlays = import ../pkgs args;
     nixpkgs.config.allowUnfree = true;