diff --git a/async/debounce.ts b/async/debounce.ts
index 7e9fef2fe..6df1a84bb 100644
--- a/async/debounce.ts
+++ b/async/debounce.ts
@@ -58,7 +58,7 @@ export function debounce<T extends Array<any>>(
       debounced.clear();
       fn.call(debounced, ...args);
     };
-    timeout = setTimeout(flush, wait);
+    timeout = Number(setTimeout(flush, wait));
   }) as DebouncedFunction<T>;
 
   debounced.clear = () => {