diff --git a/libs/langchain/langchain/agents/output_parsers/xml.py b/libs/langchain/langchain/agents/output_parsers/xml.py
index 9c2ebdd791b..bfc90f4589a 100644
--- a/libs/langchain/langchain/agents/output_parsers/xml.py
+++ b/libs/langchain/langchain/agents/output_parsers/xml.py
@@ -1,5 +1,5 @@
 import re
-from typing import Literal, Union, Optional
+from typing import Literal, Optional, Union
 
 from langchain_core.agents import AgentAction, AgentFinish
 from pydantic import Field