diff --git a/ospfd/ospf_zebra.c b/ospfd/ospf_zebra.c
index 72ffe76..a8e1630 100644
--- a/ospfd/ospf_zebra.c
+++ b/ospfd/ospf_zebra.c
@@ -66,6 +66,8 @@
     zlog_info ("Zebra: interface add %s index %d flags %ld metric %d mtu %d",
 	       ifp->name, ifp->ifindex, ifp->flags, ifp->metric, ifp->mtu);
 
+  assert(ifp->info);
+
   if (!OSPF_IF_PARAM_CONFIGURED (IF_DEF_PARAMS (ifp), type))
     {
       SET_IF_PARAM (IF_DEF_PARAMS (ifp), type);