diff --git a/net/mptcp/pm_netlink.c b/net/mptcp/pm_netlink.c
index 1d64c9fed39e..67ece399ef60 100644
--- a/net/mptcp/pm_netlink.c
+++ b/net/mptcp/pm_netlink.c
@@ -699,7 +699,6 @@ int mptcp_pm_nl_mp_prio_send_ack(struct mptcp_sock *msk,
 
 		if (subflow->backup != bkup)
 			msk->last_snd = NULL;
-		subflow->backup = bkup;
 		subflow->send_mp_prio = 1;
 		subflow->request_bkup = bkup;
 		__MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_MPPRIOTX);