diff --git a/ospf6d/ospf6_route.h b/ospf6d/ospf6_route.h
index 42eb69e..2fb2c1d 100644
--- a/ospf6d/ospf6_route.h
+++ b/ospf6d/ospf6_route.h
@@ -41,7 +41,7 @@
 struct ospf6_nexthop
 {
   /* Interface index */
-  unsigned int ifindex;
+  ifindex_t ifindex;
 
   /* IP address, if any */
   struct in6_addr address;