diff --git a/src/koa.test.ts b/src/koa.test.ts
index e90f266..996ed2e 100644
--- a/src/koa.test.ts
+++ b/src/koa.test.ts
@@ -78,4 +78,6 @@ test('setting a 200-level response code overrides the response', async () => {
 
   const createRes = await client.post('/posts');
   expect(createRes.status).toStrictEqual(200);
+
+  server.close();
 });