diff --git a/test/ganeti.config_unittest.py b/test/ganeti.config_unittest.py
index 36188faeb7f80378e3e7d6ba28ae699eea99ffb1..30261d649ddf8858d4ca687e5c1ef5e83fb1a8a8 100755
--- a/test/ganeti.config_unittest.py
+++ b/test/ganeti.config_unittest.py
@@ -76,7 +76,8 @@ class TestConfigRunner(unittest.TestCase):
 
     master_node_config = objects.Node(name=me.name,
                                       primary_ip=me.ip,
-                                      secondary_ip=ip)
+                                      secondary_ip=ip,
+                                      serial_no=1)
 
     cfg.InitConfig(constants.CONFIG_VERSION,
                    cluster_config, master_node_config)