diff --git a/flake.nix b/flake.nix
index 8d2d957..63df564 100644
--- a/flake.nix
+++ b/flake.nix
@@ -84,5 +84,7 @@
     forEachHost = fn: lib.mergeAttrsList (map fn hostnames);
   in {
     nixosConfigurations = forEachHost makeSystem;
+
+    formatter.x86_64-linux = nixpkgs.legacyPackages.x86_64-linux.nixfmt-tree;
   };
 }