diff --git a/kombu/utils/json.py b/kombu/utils/json.py
index 22f6a3ad2..e586b2aeb 100644
--- a/kombu/utils/json.py
+++ b/kombu/utils/json.py
@@ -128,6 +128,7 @@ def register_type(
     """
     _register_type(t, marker, encoder, decoder, is_default_encoder=False)
 
+
 def _register_type(
     t: type[T],
     marker: str | None,
@@ -149,7 +150,7 @@ def _register_default_types():
     # NOTE: datetime should be registered before date,
     # because datetime is also instance of date.
     _register_type(datetime, "datetime", datetime.isoformat,
-                  datetime.fromisoformat)
+                    datetime.fromisoformat)
     _register_type(
         date,
         "date",