diff --git a/isisd/isis_route.h b/isisd/isis_route.h
index 5adea22..0d2379c 100644
--- a/isisd/isis_route.h
+++ b/isisd/isis_route.h
@@ -28,7 +28,7 @@
 #ifdef HAVE_IPV6
 struct isis_nexthop6
 {
-  unsigned int ifindex;
+  ifindex_t ifindex;
   struct in6_addr ip6;
   struct in6_addr router_address6;
   unsigned int lock;
@@ -37,7 +37,7 @@
 
 struct isis_nexthop
 {
-  unsigned int ifindex;
+  ifindex_t ifindex;
   struct in_addr ip;
   struct in_addr router_address;
   unsigned int lock;