diff --git a/aider/repo.py b/aider/repo.py
index bad23381e..0290dfaa2 100644
--- a/aider/repo.py
+++ b/aider/repo.py
@@ -37,6 +37,7 @@ class GitRepo:
         self.attribute_committer = attribute_committer
         self.attribute_commit_message = attribute_commit_message
         self.commit_prompt = commit_prompt
+        self.subtree_only = subtree_only
 
         if git_dname:
             check_fnames = [git_dname]