diff --git a/net/core/netprio_cgroup.c b/net/core/netprio_cgroup.c
index 9ae183a9a38184c97478017b71b8f5a48f0dd5f5..72c638780805c71bfda4b126cbbd6851e343d798 100644
--- a/net/core/netprio_cgroup.c
+++ b/net/core/netprio_cgroup.c
@@ -108,7 +108,7 @@ static void extend_netdev_table(struct net_device *dev, u32 new_len)
 static void update_netdev_tables(void)
 {
 	struct net_device *dev;
-	u32 max_len = atomic_read(&max_prioidx);
+	u32 max_len = atomic_read(&max_prioidx) + 1;
 	struct netprio_map *map;
 
 	rtnl_lock();