diff --git a/t/unit/test_utils.py b/t/unit/test_utils.py
index af092a50..566e9050 100644
--- a/t/unit/test_utils.py
+++ b/t/unit/test_utils.py
@@ -98,6 +98,25 @@ def test_make_aware_not_use_tz_naive_not_dst(self, mock_getattr, mock_is_naive,
     @mock.patch('django_celery_beat.utils.time.localtime')
     @mock.patch('django_celery_beat.utils.timezone.is_naive')
     @mock.patch('django_celery_beat.utils.getattr')
+    def test_make_aware_not_use_tz_naive_negative_dst(self, mock_getattr, mock_is_naive, mock_localtime_1, mock_make_aware, mock_get_default_timezone, mock_localtime_2):
+        dt = datetime(2022, 11, 6, 1, 15, 0)
+        mock_getattr.return_value = False
+        mock_is_naive.return_value = True
+        mock_get_default_timezone.return_value = "America/Los_Angeles"
+        mock_localtime_1.return_value = time.struct_time([2022, 11, 6, 1, 15, 0, 0, 310, -1])
+        mock_make_aware.return_value = dt
+
+        self.assertEquals(utils.make_aware(dt), dt)
+
+        mock_localtime_1.assert_called_with()
+        mock_make_aware.assert_called_with(dt, "America/Los_Angeles", is_dst=None)
+        mock_get_default_timezone.assert_called()
+    @mock.patch('django_celery_beat.utils.timezone.localtime')
+    @mock.patch('django_celery_beat.utils.timezone.get_default_timezone')
+    @mock.patch('django_celery_beat.utils.timezone.make_aware')
+    @mock.patch('django_celery_beat.utils.time.localtime')
+    @mock.patch('django_celery_beat.utils.timezone.is_naive')
+    @mock.patch('django_celery_beat.utils.getattr')
     def test_make_aware_not_use_tz_not_naive_dst(self, mock_getattr, mock_is_naive, mock_localtime_1, mock_make_aware, mock_get_default_timezone, mock_localtime_2):
         dt = datetime(2022, 11, 6, 1, 15, 0)
         mock_getattr.return_value = False