diff --git a/aleksis/core/mixins.py b/aleksis/core/mixins.py
index a84c9611d858241b116c4c71c83770f1faafe035..17140aa00f53d531740c1054cc6f18eb0ccfe2f9 100644
--- a/aleksis/core/mixins.py
+++ b/aleksis/core/mixins.py
@@ -281,6 +281,7 @@ class ExtensibleModel(models.Model, metaclass=_ExtensibleModelBase):
                 if ExtensibleModel not in field.related_model.__mro__:
                     # Related model is not extensible and thus has no syncable fields
                     continue
+
                 # Recurse into related model to get its fields as well
                 for subfield in field.related_model.syncable_fields():
                     # generate virtual field names for proxy access
@@ -309,6 +310,8 @@ class ExtensibleModel(models.Model, metaclass=_ExtensibleModelBase):
             elif field.editable and not field.auto_created:
                 fields.append(field)
 
+        return fields
+
     @classmethod
     def syncable_fields_choices(cls) -> Tuple[Tuple[str, str]]:
         """Collect all fields that can be synced on a model."""