diff --git a/zebra/rt_netlink.c b/zebra/rt_netlink.c
index b164c7a..2539d61 100644
--- a/zebra/rt_netlink.c
+++ b/zebra/rt_netlink.c
@@ -69,7 +69,7 @@
 /* Note: on netlink systems, there should be a 1-to-1 mapping between interface
    names and ifindex values. */
 static void
-set_ifindex(struct interface *ifp, unsigned int ifi_index)
+set_ifindex(struct interface *ifp, ifindex_t ifi_index)
 {
   struct interface *oifp;