diff --git a/notebook/agentchat_reasoning_agent.ipynb b/notebook/agentchat_reasoning_agent.ipynb
index a722392d5a..78e7623892 100644
--- a/notebook/agentchat_reasoning_agent.ipynb
+++ b/notebook/agentchat_reasoning_agent.ipynb
@@ -3698,6 +3698,7 @@
     "reason_agent_for_writer = ReasoningAgent(\n",
     "    name=\"reason_agent\",\n",
     "    llm_config={\"config_list\": config_list},\n",
+    "    grader_llm_config=grader_llm_config,\n",
     "    verbose=verbose,\n",
     "    reason_config={\"method\": \"lats\", \"nsim\": 2, \"max_depth\": 3},\n",
     ")\n"