diff --git a/aider/io.py b/aider/io.py
index 852cfaa5e..6405c5666 100644
--- a/aider/io.py
+++ b/aider/io.py
@@ -312,7 +312,7 @@ class InputOutput:
             return
         FileHistory(self.input_history_file).append_string(inp)
         # Also add to the in-memory history if it exists
-        if hasattr(self, 'session') and hasattr(self.session, 'history'):
+        if hasattr(self, "session") and hasattr(self.session, "history"):
             self.session.history.append_string(inp)
 
     def get_input_history(self):