diff --git a/flake.nix b/flake.nix
index 84d7beb..50a2fa8 100644
--- a/flake.nix
+++ b/flake.nix
@@ -8,7 +8,7 @@
       pkgs = import nixpkgs { inherit system; };
     in
     {
-      formatter = pkgs.nixpkgs-fmt;
+      formatter = pkgs.alejandra;
 
       packages = rec {
         default = posixlycorrect;