diff --git a/aider/args.py b/aider/args.py
index 1a316ea76..3b3e85b52 100644
--- a/aider/args.py
+++ b/aider/args.py
@@ -14,7 +14,6 @@ def get_parser(default_config_files, git_root):
         description="aider is GPT powered coding in your terminal",
         add_config_file_help=True,
         default_config_files=default_config_files,
-        config_file_parser_class=configargparse.YAMLConfigFileParser,
         auto_env_var_prefix="AIDER_",
     )
     group = parser.add_argument_group("Main")