diff --git a/ospfd/ospf_packet.c b/ospfd/ospf_packet.c
index 7a4d027843..8f0d8537fa 100644
--- a/ospfd/ospf_packet.c
+++ b/ospfd/ospf_packet.c
@@ -3103,7 +3103,8 @@ ospf_make_hello (struct ospf_interface *oi, struct stream *s)
   int flag = 0;
 
   /* Set netmask of interface. */
-  if (oi->type != OSPF_IFTYPE_POINTOPOINT &&
+  if (!(CHECK_FLAG(oi->connected->flags, ZEBRA_IFA_UNNUMBERED) &&
+        oi->type == OSPF_IFTYPE_POINTOPOINT) &&
       oi->type != OSPF_IFTYPE_VIRTUALLINK)
     masklen2ip (oi->address->prefixlen, &mask);
   else