diff --git a/system/hosts/Styx.nix b/system/hosts/Styx.nix
index b0b3253..f3e1f48 100644
--- a/system/hosts/Styx.nix
+++ b/system/hosts/Styx.nix
@@ -25,7 +25,6 @@ in
       extra-platforms = [ "x86_64-darwin" ];
 
       log-lines = 25;
-      auto-optimise-store = true;
       keep-derivations = true;
       keep-outputs = true;
       extra-nix-path = "nixpkgs=flake:nixpkgs";
@@ -60,6 +59,10 @@ in
       connect-timeout = 5;
     };
 
+    optimise = {
+      automatic = true;
+    };
+
     configureBuildUsers = true;
 
     distributedBuilds = true;