diff --git a/src/backend/distributed/operations/node_protocol.c b/src/backend/distributed/operations/node_protocol.c
index 93adcd9e5..680bda22f 100644
--- a/src/backend/distributed/operations/node_protocol.c
+++ b/src/backend/distributed/operations/node_protocol.c
@@ -748,7 +748,7 @@ GetRelationIdentityOrPK(Relation rel)
 	{
 /* Determine the index OID of the primary key (PG18 adds a second parameter) */
 #if PG_VERSION_NUM >= PG_VERSION_18
-		idxoid = RelationGetPrimaryKeyIndex(rel, false);
+		idxoid = RelationGetPrimaryKeyIndex(rel, false /* deferred_ok */);
 #else
 		idxoid = RelationGetPrimaryKeyIndex(rel);
 #endif