diff --git a/test/cancel-ussd b/test/cancel-ussd
index 73796228..52465919 100755
--- a/test/cancel-ussd
+++ b/test/cancel-ussd
@@ -10,7 +10,10 @@ manager = dbus.Interface(bus.get_object('org.ofono', '/'),
 
 modems = manager.GetModems()
 
-path, properties = modems[0]
+if (len(sys.argv) == 2):
+	path = sys.argv[1]
+else:
+	path = modems[0][0]
 
 ussd = dbus.Interface(bus.get_object('org.ofono', path),
 					'org.ofono.SupplementaryServices')