diff --git a/aider/main.py b/aider/main.py
index 308eead03..0e5792e4e 100644
--- a/aider/main.py
+++ b/aider/main.py
@@ -6,6 +6,7 @@ import threading
 from pathlib import Path
 
 import git
+import gitdb
 from dotenv import load_dotenv
 from prompt_toolkit.enums import EditingMode