diff --git a/ospf6d/ospf6_neighbor.h b/ospf6d/ospf6_neighbor.h
index 93ffa28..54b7ffe 100644
--- a/ospf6d/ospf6_neighbor.h
+++ b/ospf6d/ospf6_neighbor.h
@@ -53,7 +53,7 @@
   u_int32_t router_id;
 
   /* Neighbor Interface ID */
-  u_int32_t ifindex;
+  ifindex_t ifindex;
 
   /* Router Priority of this neighbor */
   u_char priority;