diff --git a/aider/sendchat.py b/aider/sendchat.py
index 1622de24f..bc400826f 100644
--- a/aider/sendchat.py
+++ b/aider/sendchat.py
@@ -44,7 +44,7 @@ def sanity_check_messages(messages):
 
 def ensure_alternating_roles(messages):
     """Ensure messages alternate between 'assistant' and 'user' roles.
-    
+
     Inserts empty messages of the opposite role when consecutive messages
     of the same role are found.