diff --git a/schemas/mlag.yml b/schemas/mlag.yml
index 8d73251..c549b81 100644
--- a/schemas/mlag.yml
+++ b/schemas/mlag.yml
@@ -92,6 +92,7 @@ nodes:
         peer: InfraDevice
         cardinality: one
         kind: Parent
+        optional: false
       - name: mlag_domain
         peer: InfraMlagDomain
         cardinality: one