diff --git a/ws/example_client.ts b/ws/example_client.ts
index 665c4cd8ca..e3f2f355eb 100644
--- a/ws/example_client.ts
+++ b/ws/example_client.ts
@@ -44,7 +44,9 @@ async function main(): Promise<void> {
     }
     // FIXME: Without this,
     // sock.receive() won't resolved though it is readable...
-    await new Promise((resolve): void => setTimeout(resolve, 0));
+    await new Promise((resolve): void => {
+      setTimeout(resolve, 0);
+    });
   }
   await sock.close(1000);
   // FIXME: conn.close() won't shutdown process...