diff --git a/containers/getmail/default.nix b/containers/getmail/default.nix
index cfee1d9..b84e54b 100644
--- a/containers/getmail/default.nix
+++ b/containers/getmail/default.nix
@@ -1,4 +1,4 @@
-{ nglib, nixpkgs }@a:
+{ nglib, nixpkgs }:
 nglib.makeSystem {
   system = "x86_64-linux";
   name = "ra-systems-getmail";