diff --git a/ospfd/ospf_packet.c b/ospfd/ospf_packet.c
index f141822..facba89 100644
--- a/ospfd/ospf_packet.c
+++ b/ospfd/ospf_packet.c
@@ -3022,7 +3022,8 @@
   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