diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c
index 15a70af7b776..8f18509204b6 100644
--- a/net/mptcp/protocol.c
+++ b/net/mptcp/protocol.c
@@ -2056,8 +2056,8 @@ static void mptcp_rcv_space_adjust(struct mptcp_sock *msk, int copied)
 
 	msk->rcvq_space.copied += copied;
 
-	mstamp = div_u64(tcp_clock_ns(), NSEC_PER_USEC);
-	time = tcp_stamp_us_delta(mstamp, msk->rcvq_space.time);
+	mstamp = mptcp_stamp();
+	time = tcp_stamp_us_delta(mstamp, READ_ONCE(msk->rcvq_space.time));
 
 	rtt_us = msk->rcvq_space.rtt_us;
 	if (rtt_us && time < (rtt_us >> 3))
@@ -3421,6 +3421,7 @@ struct sock *mptcp_sk_clone_init(const struct sock *sk,
 	__mptcp_propagate_sndbuf(nsk, ssk);
 
 	mptcp_rcv_space_init(msk, ssk);
+	msk->rcvq_space.time = mptcp_stamp();
 
 	if (mp_opt->suboptions & OPTION_MPTCP_MPC_ACK)
 		__mptcp_subflow_fully_established(msk, subflow, mp_opt);
@@ -3438,8 +3439,6 @@ void mptcp_rcv_space_init(struct mptcp_sock *msk, const struct sock *ssk)
 	msk->rcvq_space.copied = 0;
 	msk->rcvq_space.rtt_us = 0;
 
-	msk->rcvq_space.time = tp->tcp_mstamp;
-
 	/* initial rcv_space offering made to peer */
 	msk->rcvq_space.space = min_t(u32, tp->rcv_wnd,
 				      TCP_INIT_CWND * tp->advmss);
@@ -3652,6 +3651,7 @@ void mptcp_finish_connect(struct sock *ssk)
 	 * accessing the field below
 	 */
 	WRITE_ONCE(msk->local_key, subflow->local_key);
+	WRITE_ONCE(msk->rcvq_space.time, mptcp_stamp());
 
 	mptcp_pm_new_connection(msk, ssk, 0);
 }
diff --git a/net/mptcp/protocol.h b/net/mptcp/protocol.h
index 30d5e5719793..27b1698c5aa2 100644
--- a/net/mptcp/protocol.h
+++ b/net/mptcp/protocol.h
@@ -870,6 +870,11 @@ static inline bool mptcp_is_fully_established(struct sock *sk)
 	       READ_ONCE(mptcp_sk(sk)->fully_established);
 }
 
+static inline u64 mptcp_stamp(void)
+{
+	return div_u64(tcp_clock_ns(), NSEC_PER_USEC);
+}
+
 void mptcp_rcv_space_init(struct mptcp_sock *msk, const struct sock *ssk);
 void mptcp_data_ready(struct sock *sk, struct sock *ssk);
 bool mptcp_finish_join(struct sock *sk);