diff --git a/src/black/lines.py b/src/black/lines.py
index 63914c9c785..30622650d53 100644
--- a/src/black/lines.py
+++ b/src/black/lines.py
@@ -308,7 +308,7 @@ def has_magic_trailing_comma(
             if comma.parent is None:
                 return False
             if Preview.skip_magic_trailing_comma_in_subscript in self.mode:
-                return bool(
+                return (
                     comma.parent.type != syms.subscriptlist
                     or closing.opening_bracket is None
                     or not is_one_sequence_between(