diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index 69f9a0ec764d3e8503cb46c1d3d4fa380e5b87f3..d7b81e4fdd5631c0c537cd971cad3bebb72bb38d 100644
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -213,7 +213,7 @@ static int check_filter(struct tap_filter *filter, const struct sk_buff *skb)
 
 /* Network device part of the driver */
 
-static unsigned int tun_net_id;
+static int tun_net_id;
 struct tun_net {
 	struct list_head dev_list;
 };