diff --git a/ospfd/ospf_route.c b/ospfd/ospf_route.c
index c1c11f1..9889d6b 100644
--- a/ospfd/ospf_route.c
+++ b/ospfd/ospf_route.c
@@ -192,8 +192,8 @@
     {
       if (rn && rn->info)
         {
-          struct prefix_ipv4 *p = &rn->p;
-          if ( (ext_rn = route_node_lookup (external_routes, p)) )
+          struct prefix_ipv4 *p = (struct prefix_ipv4 *)(&rn->p);
+          if ( (ext_rn = route_node_lookup (external_routes, (struct prefix *)p)) )
             {
               ospf_zebra_delete (p, ext_rn->info);
               if (ext_rn->info)