diff --git a/superset/db_engine_specs/base.py b/superset/db_engine_specs/base.py
index 3e065578ced0a..839c38eb30962 100644
--- a/superset/db_engine_specs/base.py
+++ b/superset/db_engine_specs/base.py
@@ -85,6 +85,7 @@
 
 logger = logging.getLogger()
 
+
 class TimeGrain(NamedTuple):
     name: str  # TODO: redundant field, remove
     label: str