diff --git a/src/useAsync.ts b/src/useAsync.ts
index 509f99916f..c648c69197 100644
--- a/src/useAsync.ts
+++ b/src/useAsync.ts
@@ -3,10 +3,13 @@ import { useState, useEffect, useCallback, DependencyList } from 'react';
 export type AsyncState<T> =
 | {
   loading: true;
+  error?: undefined;
+  value?: undefined;
 }
 | {
   loading: false;
   error: Error;
+  value?: undefined;
 }
 | {
   loading: false;