diff --git a/docs/docs/integrations/chat/openai.ipynb b/docs/docs/integrations/chat/openai.ipynb
index b59c3300ae6..54db230ba95 100644
--- a/docs/docs/integrations/chat/openai.ipynb
+++ b/docs/docs/integrations/chat/openai.ipynb
@@ -574,11 +574,11 @@
     "%import common.INT\n",
     "\"\"\"\n",
     "\n",
-    "format = {\"type\": \"grammar\", \"syntax\": \"lark\", \"definition\": grammar}\n",
+    "format_ = {\"type\": \"grammar\", \"syntax\": \"lark\", \"definition\": grammar}\n",
     "\n",
     "\n",
     "# highlight-next-line\n",
-    "@custom_tool(format=format)\n",
+    "@custom_tool(format=format_)\n",
     "def do_math(input_string: str) -> str:\n",
     "    \"\"\"Do a mathematical operation.\"\"\"\n",
     "    return \"27\"\n",