diff --git a/mongoengine/fields.py b/mongoengine/fields.py
index de9b44fa..49959983 100644
--- a/mongoengine/fields.py
+++ b/mongoengine/fields.py
@@ -879,7 +879,7 @@ class ReferenceField(BaseField):
         """Convert a MongoDB-compatible type to a Python type.
         """
         if (not self.dbref and
-            not isinstance(value, (DBRef, Document, EmbeddedDocument))):
+           not isinstance(value, (DBRef, Document, EmbeddedDocument))):
             collection = self.document_type._get_collection_name()
             value = DBRef(collection, self.document_type.id.to_python(value))
         return value