diff --git a/test-packages/dbus.py b/test-packages/dbus.py
index a03885d1..64cc1c1b 100644
--- a/test-packages/dbus.py
+++ b/test-packages/dbus.py
@@ -1,2 +1,5 @@
 class DBusException(Exception):
     pass
+
+class SystemBus(object):
+    pass