diff --git a/aider/main.py b/aider/main.py
index 9da90e161..a8535d02c 100644
--- a/aider/main.py
+++ b/aider/main.py
@@ -904,6 +904,7 @@ def main(argv=None, input=None, output=None, force_git_root=None, return_coder=F
                 commit_prompt=args.commit_prompt,
                 subtree_only=args.subtree_only,
                 git_commit_verify=args.git_commit_verify,
+                attribute_co_authored_by=args.attribute_co_authored_by, # Pass the arg
             )
         except FileNotFoundError:
             pass