diff --git a/hc/api/tests/test_notify_signal.py b/hc/api/tests/test_notify_signal.py
index 2ac57633..552149f0 100644
--- a/hc/api/tests/test_notify_signal.py
+++ b/hc/api/tests/test_notify_signal.py
@@ -10,7 +10,7 @@ from hc.api.models import Channel, Check, Notification, TokenBucket
 from hc.test import BaseTestCase
 
 
-@override_settings(SIGNAL_CLI_USERNAME="+987654321")
+@override_settings(SIGNAL_CLI_ENABLED=True)
 class NotifySignalTestCase(BaseTestCase):
     def setUp(self):
         super().setUp()
diff --git a/hc/api/transports.py b/hc/api/transports.py
index 79a53cbd..d87eb9c5 100644
--- a/hc/api/transports.py
+++ b/hc/api/transports.py
@@ -22,6 +22,7 @@ try:
     import dbus
 except ImportError:
     # Enforce
+    dbus = None
     settings.SIGNAL_CLI_ENABLED = False