diff --git a/shell.nix b/shell.nix
index b0d4e97..69e6ac4 100644
--- a/shell.nix
+++ b/shell.nix
@@ -34,6 +34,7 @@
   name = "monogon-nix";
   targetPkgs = pkgs: with pkgs; [
     git
+    buildifier
     (stdenv.mkDerivation {
       name = "bazel";
       src = builtins.fetchurl  {