diff --git a/contrib/package/nix/copyparty/default.nix b/contrib/package/nix/copyparty/default.nix
index c7fcbfc2..28d733ab 100644
--- a/contrib/package/nix/copyparty/default.nix
+++ b/contrib/package/nix/copyparty/default.nix
@@ -8,6 +8,7 @@
   jinja2,
   impacket,
   pyopenssl,
+  cfssl,
   argon2-cffi,
   pillow,
   pyvips,