diff --git a/flake.nix b/flake.nix
index 3b86ac5..6293139 100644
--- a/flake.nix
+++ b/flake.nix
@@ -35,6 +35,7 @@
                         smlnj
                         swiProlog
                         gnu-smalltalk
+                        zip
                     ];
                 };
             }