diff --git a/common/nix-settings.nix b/common/nix-settings.nix
index caa16f9..eb32daf 100644
--- a/common/nix-settings.nix
+++ b/common/nix-settings.nix
@@ -29,6 +29,7 @@ in
     ];
     # use all cores for building
     cores = 0;
+    auto-optimise-store = true;
   };
   # TODO: manage access token with sops instead of manual deployment
   # permissions: needs to be readable by the user invoking nix and root (for nix daemon)