diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index b5acc9723..72d4d5702 100755
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -1302,7 +1302,7 @@ void ip_rt_get_source(u8 *addr, struct sk_buff *skb, struct rtable *rt)
 		struct flowi4 fl4 = {
 			.daddr = iph->daddr,
 			.saddr = iph->saddr,
-			.flowi4_tos = RT_TOS(iph->tos),
+			.flowi4_tos = iph->tos & IPTOS_RT_MASK,
 			.flowi4_oif = rt->dst.dev->ifindex,
 			.flowi4_iif = skb->dev->ifindex,
 			.flowi4_mark = skb->mark,