diff --git a/util/BUILD.gn b/util/BUILD.gn
index de89adf..bf9ce57 100755
--- a/util/BUILD.gn
+++ b/util/BUILD.gn
@@ -54,6 +54,7 @@ action("gen_util_abc") {
     rebase_path("${ts2abc_build_path}"),
     "--node-modules",
     rebase_path("${node_modules}"),
+    "--module",
   ]
   deps = [
     ":build_ts_js",