diff --git a/src/tyro/_cli.py b/src/tyro/_cli.py
index c8b0d347..680e238f 100644
--- a/src/tyro/_cli.py
+++ b/src/tyro/_cli.py
@@ -324,9 +324,6 @@ def _cli_impl(
         if not arg.startswith("--"):
             continue
 
-        delimeter = _strings.get_delimeter()
-        to_swap_delimeter = "-" if delimeter == "_" else "_"
-
         if "=" in arg:
             arg, _, val = arg.partition("=")
             fixed = "--" + _strings.replace_delimeter_in_part(arg[2:]) + "=" + val
diff --git a/tests/test_collections.py b/tests/test_collections.py
index a8782c0e..e4aa3fe8 100644
--- a/tests/test_collections.py
+++ b/tests/test_collections.py
@@ -467,8 +467,10 @@ def main(x: tuple = ()) -> Any:
 
     assert tyro.cli(main, args="--x 0 1 2 3".split(" ")) == ("0", "1", "2", "3")
 
+
 def test_narrowing_edge_case() -> None:
     """https://github.com/brentyi/tyro/issues/136"""
+
     @dataclasses.dataclass
     class Config:
         _target: Type = dataclasses.field(default_factory=lambda: MyClass)