diff --git a/src/oss/langgraph/streaming.mdx b/src/oss/langgraph/streaming.mdx
index c86c5a11ca..1fac410f4c 100644
--- a/src/oss/langgraph/streaming.mdx
+++ b/src/oss/langgraph/streaming.mdx
@@ -703,7 +703,7 @@ for await (const [msg, metadata] of await graph.stream(
   });
 
   const graph = new StateGraph(State)
-    .addNode("callModel", (state) => {
+    .addNode("callModel", async (state) => {
       const topic = state.topic;
       console.log("Writing joke...");