diff --git a/lib/constants.py b/lib/constants.py
index 302e0c9cfc72b9d93a723f45f6af1388a70b181c..91c6e31fda621b4bdf83c3b3ba6f1558418c3a1e 100644
--- a/lib/constants.py
+++ b/lib/constants.py
@@ -625,10 +625,12 @@ MASTER_POOL_SIZE_DEFAULT = 10
 
 CONFD_PROTOCOL_VERSION = 1
 
+CONFD_REQ_PING = 0
 CONFD_REQ_NODE_ROLE_BYNAME = 1
 CONFD_REQ_NODE_PIP_BY_INSTANCE_IP = 2
 
 CONFD_REQS = frozenset([
+  CONFD_REQ_PING,
   CONFD_REQ_NODE_ROLE_BYNAME,
   CONFD_REQ_NODE_PIP_BY_INSTANCE_IP,
   ])