diff --git a/default.nix b/default.nix
index 8905c5a..dd800b1 100644
--- a/default.nix
+++ b/default.nix
@@ -318,7 +318,6 @@ in
 
     forwards = mkOption {
       type = with types; attrsOf (either (listOf str) str);
-      default = {};
       example = {
         "user@example.com" = "user@elsewhere.com";
       };