diff --git a/proto/ospf/iface.c b/proto/ospf/iface.c
index 9050f7b1..3da8f56c 100644
--- a/proto/ospf/iface.c
+++ b/proto/ospf/iface.c
@@ -537,7 +537,7 @@ ospf_iface_new(struct ospf_area *oa, struct ifa *addr, struct ospf_iface_patt *i
 #ifdef OSPFv2
   ifa->autype = ip->autype;
   ifa->passwords = ip->passwords;
-  ifa->ptp_netmask = !(addr->flags & IA_PEER);
+  ifa->ptp_netmask = addr ? !(addr->flags & IA_PEER) : 0;
   if (ip->ptp_netmask < 2)
     ifa->ptp_netmask = ip->ptp_netmask;
 #endif