diff --git a/include/net/mptcp.h b/include/net/mptcp.h
index cde6c6d340323..0cfa9896c9eab 100644
--- a/include/net/mptcp.h
+++ b/include/net/mptcp.h
@@ -480,6 +480,7 @@ void mptcp_fallback(struct sock *master_sk);
 void mptcp_clean_rtx_infinite(struct sk_buff *skb, struct sock *sk);
 void mptcp_fin(struct multipath_pcb *mpcb);
 void mptcp_retransmit_timer(struct sock *meta_sk);
+void mptcp_mark_reinjected(struct sock *sk, struct sk_buff *skb);
 
 static inline int mptcp_skb_cloned(const struct sk_buff *skb,
 		const struct tcp_sock *tp)
@@ -964,6 +965,7 @@ static inline void mptcp_clean_rtx_queue(struct sock *meta_sk) {}
 static inline void mptcp_clean_rtx_infinite(struct sk_buff *skb,
 		struct sock *sk) {}
 static inline void mptcp_retransmit_timer(struct sock *meta_sk) {}
+static inline void mptcp_mark_reinjected(struct sock *sk, struct sk_buff *skb) {}
 static inline void mptcp_set_rto(struct sock *sk) {}
 static inline void mptcp_reset_xmit_timer(struct sock *meta_sk) {}
 static inline void mptcp_send_fin(struct sock *meta_sk) {}
diff --git a/net/ipv4/mptcp.c b/net/ipv4/mptcp.c
index 7ded85c6e035a..6384d13b57218 100644
--- a/net/ipv4/mptcp.c
+++ b/net/ipv4/mptcp.c
@@ -789,6 +789,26 @@ void mptcp_retransmit_timer(struct sock *meta_sk)
 			meta_icsk->icsk_rto, TCP_RTO_MAX * 2);
 }
 
+void mptcp_mark_reinjected(struct sock *sk, struct sk_buff *skb) {
+	struct sock *meta_sk;
+	struct tcp_sock *tp = tcp_sk(sk);
+	struct sk_buff *skb_it;
+
+	if (!tp->mpc)
+		return;
+
+	meta_sk = mptcp_meta_sk(sk);
+	skb_it = tcp_write_queue_head(meta_sk);
+
+	while (skb_it && skb_it != tcp_send_head(meta_sk)) {
+		if (TCP_SKB_CB(skb_it)->data_seq == TCP_SKB_CB(skb)->data_seq) {
+			skb_it->path_mask |= PI_TO_FLAG(tp->path_index);
+			break;
+		}
+		skb_it = tcp_write_queue_next(meta_sk, skb_it);
+	}
+}
+
 
 int mptcp_alloc_mpcb(struct sock *master_sk, struct request_sock *req,
 		gfp_t flags)
diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index fca5207f7b419..df7b26ce416f5 100644
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -2493,6 +2493,9 @@ static int tcp_write_xmit(struct sock *sk, unsigned int mss_now, int nonagle,
 			BUG_ON(tcp_send_head(sk) != skb);
 			tcp_event_new_data_sent(sk, skb);
 		}
+		if (sk!= subsk && reinject) {
+			mptcp_mark_reinjected(subsk, skb);
+		}
 
 		if (sk != subsk && (TCP_SKB_CB(skb)->flags & TCPHDR_FIN)) {
 			struct sock *sk_it, *sk_tmp;