diff --git a/flake.nix b/flake.nix
index 8455d1a..c6af4b4 100644
--- a/flake.nix
+++ b/flake.nix
@@ -29,6 +29,10 @@
               hlint = {};
               haskell-language-server = {};
             };
+            shell.buildInputs = with pkgs; [
+              at
+              busybox
+            ];
           };
         })
       ];