diff --git a/src/utils/is/index.ts b/src/utils/is/index.ts
index 088c6e8..74bd576 100644
--- a/src/utils/is/index.ts
+++ b/src/utils/is/index.ts
@@ -48,7 +48,7 @@ export function isNumber(val: unknown): val is number {
 /**
  * @description:  是否为AsyncFunction
  */
-export function isAsyncFunction<T = any>(val: unknown): val is Promise<T> {
+export function isAsyncFunction<T = any>(val: unknown): val is () => Promise<T> {
   return is(val, 'AsyncFunction');
 }