diff --git a/modules/nixos/default.nix b/modules/nixos/default.nix
index ac4ab14..43b6f5b 100644
--- a/modules/nixos/default.nix
+++ b/modules/nixos/default.nix
@@ -291,6 +291,11 @@ in
       settings = {
         experimental-features = [ "nix-command" "flakes" ];
         auto-optimise-store = lib.mkDefault true;
+        # The downstream flake (~/.nomarchy) is meant to be a live working
+        # tree: nomarchy-theme-sync rewrites theme-state.json on every
+        # switch (and you needn't commit each tweak), so the "Git tree is
+        # dirty" warning fires on every rebuild and is pure noise here.
+        warn-dirty = lib.mkDefault false;
       };
       gc = {
         automatic = lib.mkDefault true;