diff --git a/configuration/common/default.nix b/configuration/common/default.nix
index 4f3d445..e751363 100644
--- a/configuration/common/default.nix
+++ b/configuration/common/default.nix
@@ -16,7 +16,10 @@
 
   security.sudo.wheelNeedsPassword = false;
 
-  nix.settings.trusted-users = [ "@wheel" ];
+  nix.settings = {
+    trusted-users = [ "@wheel" ];
+    auto-optimise-store = true;
+  };
 
   users.users.clerie = {
     isNormalUser = true;