diff --git a/net/mptcp/pm_netlink.c b/net/mptcp/pm_netlink.c
index 0d459b82deb9..e9dff6382581 100644
--- a/net/mptcp/pm_netlink.c
+++ b/net/mptcp/pm_netlink.c
@@ -481,7 +481,6 @@ static void __mptcp_pm_send_ack(struct mptcp_sock *msk, struct mptcp_subflow_con
 			msk->last_snd = NULL;
 
 		subflow->send_mp_prio = 1;
-		subflow->backup = backup;
 		subflow->request_bkup = backup;
 	}