diff --git a/nixos/nix.nix b/nixos/nix.nix
index f28109b..c0019ba 100644
--- a/nixos/nix.nix
+++ b/nixos/nix.nix
@@ -22,6 +22,7 @@
     nixPath = [ "nixpkgs=${flake.inputs.nixpkgs}" ]; # Enables use of `nix-shell -p ...` etc
     registry.nixpkgs.flake = flake.inputs.nixpkgs; # Make `nix shell` etc use pinned nixpkgs
     settings = {
+      max-jobs = "auto";
       experimental-features = "nix-command flakes repl-flake";
       # I don't have an Intel mac.
       extra-platforms = lib.mkIf pkgs.stdenv.isDarwin "aarch64-darwin x86_64-darwin";