diff --git a/lib/objects.py b/lib/objects.py
index 3c3dcb6de776113dca5d8aa91800d582134db1f5..7e8de2a6d99e451aba47239b66ef81d83efa16a4 100644
--- a/lib/objects.py
+++ b/lib/objects.py
@@ -684,6 +684,7 @@ class Node(TaggableObject):
     "primary_ip",
     "secondary_ip",
     "serial_no",
+    "master_candidate",
     ]