diff --git a/src/system.nix b/src/system.nix
index 2058d3b..acf7a97 100644
--- a/src/system.nix
+++ b/src/system.nix
@@ -10,6 +10,7 @@
     package = pkgs.nixFlakes;
     extraOptions = ''
       experimental-features = nix-command flakes
+      auto-optimise-store = true
     '';
   };