diff --git a/modules/nginx.nix b/modules/nginx.nix
index 8b00e8c..37dab83 100644
--- a/modules/nginx.nix
+++ b/modules/nginx.nix
@@ -71,6 +71,7 @@ in
 
           locations = lib.mkOption {
             type = with lib.types; attrsOf (submodule {
+              options.extraConfig = lib.mkOption { };
               config.extraConfig = lib.mkIf cfg.setHSTSHeader (/* nginx */ ''
                 more_set_headers "Strict-Transport-Security: max-age=63072000; includeSubDomains; preload";
               '' + cfg.commonServerConfig + cfgv.commonLocationsConfig);