diff --git a/libs/core/langchain_core/prompts/chat.py b/libs/core/langchain_core/prompts/chat.py
index 8fec0bc09962f..5b477abd0d4da 100644
--- a/libs/core/langchain_core/prompts/chat.py
+++ b/libs/core/langchain_core/prompts/chat.py
@@ -1219,7 +1219,7 @@ def format_messages(self, **kwargs: Any) -> list[BaseMessage]:
         """
         kwargs = self._merge_partial_and_user_variables(**kwargs)
         result = []
-        
+
         for message_template in self.messages:
             if isinstance(message_template, BaseMessage):
                 # Check if the content contains any template variables