diff --git a/src/lib/yang/models/ietf-dhcpv4-types.yang b/src/lib/yang/models/ietf-dhcpv4-types.yang
index c54e64869b..4b33d2a418 100644
--- a/src/lib/yang/models/ietf-dhcpv4-types.yang
+++ b/src/lib/yang/models/ietf-dhcpv4-types.yang
@@ -30,7 +30,6 @@ module ietf-dhcpv4-types {
       description "";
       leaf ent-num {
         type uint32;
-        mandatory true;
         description "enterprise number";
       }
       leaf-list data {