diff --git a/packages/swc-helpers/src/_class_private_field_loose_key.js b/packages/swc-helpers/src/_class_private_field_loose_key.js
index 8e7d4f6284f..a8c98ee7b00 100644
--- a/packages/swc-helpers/src/_class_private_field_loose_key.js
+++ b/packages/swc-helpers/src/_class_private_field_loose_key.js
@@ -1,5 +1,5 @@
 var id = 0;
 
-export function _classPrivateFieldLooseKey(name) {
+export default function _classPrivateFieldLooseKey(name) {
     return "__private_" + id++ + "_" + name;
 }