diff --git a/flake.nix b/flake.nix
index bb1d53e..94977d0 100644
--- a/flake.nix
+++ b/flake.nix
@@ -115,5 +115,6 @@
         automapaper = ./modules/automapaper;
       };
       packages = import ./packages { inherit nixpkgs; };
+      formatter.x86_64-linux = inputs.nixpkgs.legacyPackages.x86_64-linux.nixfmt-tree;
     };
 }