diff --git a/os/hs/configuration.nix b/os/hs/configuration.nix
index bdd1ca6..d3f73b4 100644
--- a/os/hs/configuration.nix
+++ b/os/hs/configuration.nix
@@ -157,4 +157,6 @@ in {
       supportedFeatures = [ "nixos-test" "big-parallel" "kvm" "gccarch-x86-64-v3" ];
     }
   ];
+
+  nix.settings.auto-optimise-store = true;
 }