diff --git a/auditlog/diff.py b/auditlog/diff.py
index a45c38c..a69465c 100644
--- a/auditlog/diff.py
+++ b/auditlog/diff.py
@@ -218,8 +218,11 @@ def model_instance_diff(
     # and mutate instance._state.fields_cache as a side-effect.
     # Make this behavior opt-in via AUDITLOG_EXCLUDE_REVERSE_RELATIONS.
     if settings.AUDITLOG_EXCLUDE_REVERSE_RELATIONS:
+
         def is_reverse_field(f):
-            return getattr(f, "auto_created", False) and not getattr(f, "concrete", False)
+            return getattr(f, "auto_created", False) and not getattr(
+                f, "concrete", False
+            )
 
         fields = {f for f in fields if not is_reverse_field(f)}