diff --git a/tests/postgres_tests/test_aggregates.py b/tests/postgres_tests/test_aggregates.py
index ec81f5ad75..6b77787dcc 100644
--- a/tests/postgres_tests/test_aggregates.py
+++ b/tests/postgres_tests/test_aggregates.py
@@ -164,6 +164,8 @@ class TestGeneralAggregate(PostgreSQLTestCase):
             (F('char_field').desc(), 'Foo4;Foo3;Foo2;Foo1'),
             (F('char_field').asc(), 'Foo1;Foo2;Foo3;Foo4'),
             (F('char_field'), 'Foo1;Foo2;Foo3;Foo4'),
+            ('char_field', 'Foo1;Foo2;Foo3;Foo4'),
+            ('-char_field', 'Foo4;Foo3;Foo2;Foo1'),
         )
         for ordering, expected_output in ordering_test_cases:
             with self.subTest(ordering=ordering, expected_output=expected_output):