diff --git a/aider/models.py b/aider/models.py
index 9515a2d57..df7b95152 100644
--- a/aider/models.py
+++ b/aider/models.py
@@ -890,6 +890,7 @@ class Model(ModelSettings):
 
             class GitHubCopilotTokenError(Exception):
                 """Custom exception for GitHub Copilot token-related errors."""
+
                 pass
 
             # Validate GitHub Copilot token exists