diff --git a/src/content/reference/react/useOptimistic.md b/src/content/reference/react/useOptimistic.md
index d0511b1a9e9..47593a0ae5e 100644
--- a/src/content/reference/react/useOptimistic.md
+++ b/src/content/reference/react/useOptimistic.md
@@ -116,7 +116,7 @@ export default function App() {
   ]);
   async function sendMessage(formData) {
     const sentMessage = await deliverMessage(formData.get("message"));
-    setMessages([...messages, { text: sentMessage }]);
+    setMessages((messages) => [...messages, { text: sentMessage }]);
   }
   return <Thread messages={messages} sendMessage={sendMessage} />;
 }