diff --git a/simple_history/models.py b/simple_history/models.py
index 53ee8f56..d131e5e2 100644
--- a/simple_history/models.py
+++ b/simple_history/models.py
@@ -330,12 +330,14 @@ def copy_fields(self, model):
         for field in self.fields_included(model):
             field = copy.copy(field)
             field.remote_field = copy.copy(field.remote_field)
-            if field.__class__.__name__ == 'TranslationCharField':
+            if field.__class__.__name__ == "TranslationCharField":
                 old_field = field
                 field.__class__ = models.CharField
                 if hasattr(field, "max_length"):
-                    field.max_length = old_field.max_length if old_field.max_length else 255
-            if field.__class__.__name__ == 'TranslationTextField':
+                    field.max_length = (
+                        old_field.max_length if old_field.max_length else 255
+                    )
+            if field.__class__.__name__ == "TranslationTextField":
                 old_field = field
                 field.__class__ = models.TextField
             if isinstance(field, OrderWrt):