diff --git a/zebra/zserv.c b/zebra/zserv.c
index 6e4f9bbe7d..0207a3722f 100644
--- a/zebra/zserv.c
+++ b/zebra/zserv.c
@@ -1161,7 +1161,7 @@ zread_interface_delete (struct zserv *client, u_short length, struct zebra_vrf *
 }
 
 void
-zserv_nexthop_num_warn (const char *caller, const struct prefix *p, const u_char nexthop_num)
+zserv_nexthop_num_warn (const char *caller, const struct prefix *p, const unsigned int nexthop_num)
 {
   if (nexthop_num > MULTIPATH_NUM)
     {
diff --git a/zebra/zserv.h b/zebra/zserv.h
index 16700ee523..737795ad54 100644
--- a/zebra/zserv.h
+++ b/zebra/zserv.h
@@ -168,7 +168,7 @@ extern int zsend_interface_vrf_update (struct zserv *, struct interface *,
 extern pid_t pid;
 
 extern void zserv_create_header(struct stream *s, uint16_t cmd, vrf_id_t vrf_id);
-extern void zserv_nexthop_num_warn(const char *, const struct prefix *, const u_char);
+extern void zserv_nexthop_num_warn(const char *, const struct prefix *, const unsigned int);
 extern int zebra_server_send_message(struct zserv *client);
 
 #endif /* _ZEBRA_ZEBRA_H */