diff --git a/krebs/3modules/htgen.nix b/krebs/3modules/htgen.nix
index 3c8872be2..0dddca6c8 100644
--- a/krebs/3modules/htgen.nix
+++ b/krebs/3modules/htgen.nix
@@ -10,6 +10,7 @@ let
   };
 
   api = mkOption {
+    default = {};
     type = types.attrsOf (types.submodule ({ config, ... }: {
       options = {
         enable = mkEnableOption "krebs.htgen-${config.name}";