diff --git a/types/generic-pool/index.d.ts b/types/generic-pool/index.d.ts
index 0fd1f58b4b..80a3c0e9df 100644
--- a/types/generic-pool/index.d.ts
+++ b/types/generic-pool/index.d.ts
@@ -23,7 +23,7 @@ export class Pool<T> extends EventEmitter {
     destroy(resource: T): PromiseLike<void>;
     drain(): PromiseLike<void>;
     clear(): PromiseLike<void>;
-    use<U>(cb: (resource: T) => U): PromiseLike<U>;
+    use<U>(cb: (resource: T) => U | PromiseLike<U>): PromiseLike<U>;
     isBorrowedResource(resource: T): boolean;
 }