diff --git a/setup.cfg b/setup.cfg
index 1c94cf1fce..0f06e9c98b 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -9,6 +9,7 @@ column_limit = 85
 split_penalty_import_names = 100
 dedent_closing_brackets = True
 coalesce_brackets = True
+blank_line_before_nested_class_or_def = True
 
 [isort]
 combine_as_imports = True