diff --git a/evennia/scripts/tests.py b/evennia/scripts/tests.py
index 51a244a1c9..aa0b97d1ec 100644
--- a/evennia/scripts/tests.py
+++ b/evennia/scripts/tests.py
@@ -143,6 +143,13 @@ class TestExtendedLoopingCall(TestCase):
         self.assertEqual(loopcall.interval, 20)
         loopcall._scheduleFrom.assert_called_with(121)
         
+    def test_start_invalid_interval(self):
+        """ Test the .start method with interval less than zero """
+        with self.assertRaises(ValueError):
+            callback = mock.MagicMock()
+            loopcall = ExtendedLoopingCall(callback)
+            loopcall.start(-1, now=True, start_delay=None, count_start=1)
+
 def dummy_func():
     return 0
 class TestMonitorHandler(TestCase):