diff --git a/net/ipv6/af_inet6.c b/net/ipv6/af_inet6.c
index 7f092fa..9b6a37d 100644
--- a/net/ipv6/af_inet6.c
+++ b/net/ipv6/af_inet6.c
@@ -346,8 +346,11 @@
 		goto out;
 	}
 
-	if (addr_type != IPV6_ADDR_ANY)
+	if (addr_type != IPV6_ADDR_ANY) {
 		sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
+		if (addr_type != IPV6_ADDR_MAPPED)
+			np->ipv6only = 1;
+	}
 	if (snum)
 		sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
 	inet->sport = htons(inet->num);