diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
index 4f96b5c..8aebf8f 100644
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c
@@ -1130,7 +1130,8 @@
 	if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) {
 		fl6.flowi6_oif = np->mcast_oif;
 		connected = 0;
-	}
+	} else if (!fl6.flowi6_oif)
+		fl6.flowi6_oif = np->ucast_oif;
 
 	security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));