diff --git a/lib/if.c b/lib/if.c
index 3426212..44b8586 100644
--- a/lib/if.c
+++ b/lib/if.c
@@ -189,41 +189,41 @@
 
 /* Interface existance check by index. */
 struct interface *
-if_lookup_by_index_vrf (unsigned int index, vrf_id_t vrf_id)
+if_lookup_by_index_vrf (ifindex_t ifindex, vrf_id_t vrf_id)
 {
   struct listnode *node;
   struct interface *ifp;
 
   for (ALL_LIST_ELEMENTS_RO (vrf_iflist (vrf_id), node, ifp))
     {
-      if (ifp->ifindex == index)
+      if (ifp->ifindex == ifindex)
 	return ifp;
     }
   return NULL;
 }
 
 struct interface *
-if_lookup_by_index (unsigned int index)
+if_lookup_by_index (ifindex_t ifindex)
 {
-  return if_lookup_by_index_vrf (index, VRF_DEFAULT);
+  return if_lookup_by_index_vrf (ifindex, VRF_DEFAULT);
 }
 
 const char *
-ifindex2ifname_vrf (unsigned int index, vrf_id_t vrf_id)
+ifindex2ifname_vrf (ifindex_t ifindex, vrf_id_t vrf_id)
 {
   struct interface *ifp;
 
-  return ((ifp = if_lookup_by_index_vrf (index, vrf_id)) != NULL) ?
+  return ((ifp = if_lookup_by_index_vrf (ifindex, vrf_id)) != NULL) ?
   	 ifp->name : "unknown";
 }
 
 const char *
-ifindex2ifname (unsigned int index)
+ifindex2ifname (ifindex_t ifindex)
 {
-  return ifindex2ifname_vrf (index, VRF_DEFAULT);
+  return ifindex2ifname_vrf (ifindex, VRF_DEFAULT);
 }
 
-unsigned int
+ifindex_t
 ifname2ifindex_vrf (const char *name, vrf_id_t vrf_id)
 {
   struct interface *ifp;
@@ -232,7 +232,7 @@
                                                    : IFINDEX_INTERNAL;
 }
 
-unsigned int
+ifindex_t
 ifname2ifindex (const char *name)
 {
   return ifname2ifindex_vrf (name, VRF_DEFAULT);
@@ -928,7 +928,7 @@
 }
 
 #ifndef HAVE_IF_NAMETOINDEX
-unsigned int
+ifindex_t
 if_nametoindex (const char *name)
 {
   struct interface *ifp;
@@ -940,7 +940,7 @@
 
 #ifndef HAVE_IF_INDEXTONAME
 char *
-if_indextoname (unsigned int ifindex, char *name)
+if_indextoname (ifindex_t ifindex, char *name)
 {
   struct interface *ifp;
 
@@ -1005,7 +1005,7 @@
 
 /* Lookup interface by interface's IP address or interface index. */
 static struct interface *
-ifaddr_ipv4_lookup (struct in_addr *addr, unsigned int ifindex)
+ifaddr_ipv4_lookup (struct in_addr *addr, ifindex_t ifindex)
 {
   struct prefix_ipv4 p;
   struct route_node *rn;