diff --git a/graphene/types/tests/test_typemap.py b/graphene/types/tests/test_typemap.py
index dce92b00..e5dc3995 100644
--- a/graphene/types/tests/test_typemap.py
+++ b/graphene/types/tests/test_typemap.py
@@ -108,7 +108,7 @@ def test_interface():
     fields = graphql_type.fields
     assert list(fields.keys()) == ['foo', 'gizmo', 'own']
     assert fields['own'].type == graphql_type
-    assert (fields['gizmo'].args.keys()) == ['firstArg', 'oth_arg']
+    assert list(fields['gizmo'].args.keys()) == ['firstArg', 'oth_arg']
     foo_field = fields['foo']
     assert isinstance(foo_field, GraphQLField)
     assert foo_field.description == 'Field description'