diff --git a/packages/vitest-pool-workers/types/cloudflare-test.d.ts b/packages/vitest-pool-workers/types/cloudflare-test.d.ts
index 79619a51298a..6cb4adbf9578 100644
--- a/packages/vitest-pool-workers/types/cloudflare-test.d.ts
+++ b/packages/vitest-pool-workers/types/cloudflare-test.d.ts
@@ -45,7 +45,7 @@ declare module "cloudflare:test" {
 	 * Objects defined in the `main` worker.
 	 */
 	export function runInDurableObject<O extends DurableObject, R>(
-		stub: DurableObjectStub,
+		stub: DurableObjectStub<O>,
 		callback: (instance: O, state: DurableObjectState) => R | Promise<R>
 	): Promise<R>;
 	/**