diff --git a/docs/use_cases/agent_simulations/two_agent_debate_tools.ipynb b/docs/use_cases/agent_simulations/two_agent_debate_tools.ipynb
index 533670c3651..01beec445b9 100644
--- a/docs/use_cases/agent_simulations/two_agent_debate_tools.ipynb
+++ b/docs/use_cases/agent_simulations/two_agent_debate_tools.ipynb
@@ -178,9 +178,6 @@
     "        Applies the chatmodel to the message history\n",
     "        and returns the message string\n",
     "        \"\"\"\n",
-    "        human_and_system_message_content = \"\\n\".join(\n",
-    "                    [self.system_message.content] + self.message_history + [self.prefix])\n",
-    "\n",
     "        agent_chain = initialize_agent(\n",
     "            self.tools, \n",
     "            self.model, \n",