diff --git a/src/black/lines.py b/src/black/lines.py
index 08281bc..9963bc9 100644
--- a/src/black/lines.py
+++ b/src/black/lines.py
@@ -628,9 +628,7 @@ def _maybe_empty_lines_for_class_or_def(
         ):
             slc = self.semantic_leading_comment
             if (
-                Preview.empty_lines_before_class_or_def_with_leading_comments
-                in current_line.mode
-                and slc is not None
+                slc is not None
                 and slc.previous_block is not None
                 and not slc.previous_block.original_line.is_class
                 and not slc.previous_block.original_line.opens_block
diff --git a/src/black/mode.py b/src/black/mode.py
index db54b57..136f5c5 100644
--- a/src/black/mode.py
+++ b/src/black/mode.py
@@ -149,7 +149,6 @@ def supports_feature(target_versions: Set[TargetVersion], feature: Feature) -> b
 class Preview(Enum):
     """Individual preview style features."""
 
-    empty_lines_before_class_or_def_with_leading_comments = auto()
     handle_trailing_commas_in_head = auto()
     long_docstring_quotes_on_newline = auto()
     normalize_docstring_quotes_and_prefixes_properly = auto()