diff --git a/src/utils/helper.ts b/src/utils/helper.ts
index 8e79ae9a0..ae8cbb45c 100644
--- a/src/utils/helper.ts
+++ b/src/utils/helper.ts
@@ -1,5 +1,5 @@
 // `undefined` can possibly be replaced by something else.
-export const UNDEFINED: undefined = ({} as any)[0]
+export const UNDEFINED = void 0
 export const isUndefined = (v: any): v is undefined => v === UNDEFINED
 export const isFunction = (v: any): v is Function => typeof v === 'function'
 export const noop = () => {}