diff --git a/zebra/rib.h b/zebra/rib.h
index 4f99d71..4ecfaa0 100644
--- a/zebra/rib.h
+++ b/zebra/rib.h
@@ -305,6 +305,7 @@
   rib_tables_iter_state_t state;
 } rib_tables_iter_t;
 
+extern const char *nexthop_type_to_str (enum nexthop_types_t nh_type);
 extern struct nexthop *nexthop_ifindex_add (struct rib *, unsigned int);
 extern struct nexthop *nexthop_ifname_add (struct rib *, char *);
 extern struct nexthop *nexthop_blackhole_add (struct rib *);