diff --git a/flake.nix b/flake.nix
index 1bb7f9d..635ca62 100644
--- a/flake.nix
+++ b/flake.nix
@@ -325,6 +325,7 @@
                   pkg-config
                   haskell.packages.ghc946.haskell-language-server
                   jq
+                  alejandra
                 ] ++ (lib.foldl (acc: x: acc ++ x) [] (map (x: pkgs.haskell.packages.ghc946.${x}.buildInputs) [ "gi-pangocairo" "X11" "cairo" "glib" ]));
               };
         };