diff --git a/exchangelib/fields.py b/exchangelib/fields.py
index d2b8a850..764b04c2 100644
--- a/exchangelib/fields.py
+++ b/exchangelib/fields.py
@@ -1355,6 +1355,7 @@ def __hash__(self):
 
 class SingleFieldIndexedField(IndexedField):
     """A base class for all single-field indexed fields."""
+
     def __init__(self, *args, **kwargs):
         from .indexed_properties import SingleFieldIndexedElement