diff --git a/net/ipv4/af_inet.c b/net/ipv4/af_inet.c
index 1144900..d60fd73 100644
--- a/net/ipv4/af_inet.c
+++ b/net/ipv4/af_inet.c
@@ -305,7 +305,7 @@
 		sk->sk_reuse = 1;
 
 	inet = inet_sk(sk);
-	inet->is_icsk = INET_PROTOSW_ICSK & answer_flags;
+	inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) == INET_PROTOSW_ICSK;
 
 	if (SOCK_RAW == sock->type) {
 		inet->num = protocol;