diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c
index 3ca8b359e399a..8123c79e27913 100644
--- a/net/mptcp/protocol.c
+++ b/net/mptcp/protocol.c
@@ -2149,7 +2149,7 @@ static struct sock *mptcp_accept(struct sock *sk, int flags, int *err,
 		 */
 		if (WARN_ON_ONCE(!new_mptcp_sock)) {
 			tcp_sk(newsk)->is_mptcp = 0;
-			return newsk;
+			goto out;
 		}
 
 		/* acquire the 2nd reference for the owning socket */
@@ -2174,6 +2174,8 @@ static struct sock *mptcp_accept(struct sock *sk, int flags, int *err,
 				MPTCP_MIB_MPCAPABLEPASSIVEFALLBACK);
 	}
 
+out:
+	newsk->sk_kern_sock = kern;
 	return newsk;
 }