diff --git a/tests/document/test_instance.py b/tests/document/test_instance.py
index 1d3e18d0..173e02f2 100644
--- a/tests/document/test_instance.py
+++ b/tests/document/test_instance.py
@@ -3644,7 +3644,7 @@ class TestInstance(MongoDBTestCase):
             User.objects().select_related()
 
     def test_embedded_document_failed_while_loading_instance_when_it_is_not_a_dict(
-        self
+        self,
     ):
         class LightSaber(EmbeddedDocument):
             color = StringField()