diff --git a/types/index.d.ts b/types/index.d.ts
index 09824704..50702ecc 100644
--- a/types/index.d.ts
+++ b/types/index.d.ts
@@ -47,7 +47,7 @@ export function render<Q extends Queries>(
 /**
  * Unmounts React trees that were mounted with render.
  */
-export function cleanup(): Promise<void>
+export function cleanup(): void
 
 /**
  * Simply calls ReactDOMTestUtils.act(cb)