diff --git a/synapse/storage/database.py b/synapse/storage/database.py
index 53858db9a3..98aaf13945 100644
--- a/synapse/storage/database.py
+++ b/synapse/storage/database.py
@@ -1117,10 +1117,7 @@ class DatabasePool(object):
 
     @staticmethod
     def simple_select_onecol_txn(
-        txn: LoggingTransaction,
-        table: str,
-        keyvalues: Dict[str, Any],
-        retcol: str,
+        txn: LoggingTransaction, table: str, keyvalues: Dict[str, Any], retcol: str,
     ) -> List[Any]:
         sql = ("SELECT %(retcol)s FROM %(table)s") % {"retcol": retcol, "table": table}