diff --git a/net/mptcp/options.c b/net/mptcp/options.c
index 3b4ce8a06f99..4d8f2f6a8f73 100644
--- a/net/mptcp/options.c
+++ b/net/mptcp/options.c
@@ -877,7 +877,7 @@ bool mptcp_synack_options(const struct request_sock *req, unsigned int *size,
 		return true;
 	} else if (subflow_req->mp_join) {
 		opts->suboptions = OPTION_MPTCP_MPJ_SYNACK;
-		opts->backup = subflow_req->backup;
+		opts->backup = subflow_req->request_bkup;
 		opts->join_id = subflow_req->local_id;
 		opts->thmac = subflow_req->thmac;
 		opts->nonce = subflow_req->local_nonce;
diff --git a/net/mptcp/protocol.h b/net/mptcp/protocol.h
index b4ccae4f6849..d2e68f5c6288 100644
--- a/net/mptcp/protocol.h
+++ b/net/mptcp/protocol.h
@@ -370,6 +370,7 @@ struct mptcp_subflow_request_sock {
 	u16	mp_capable : 1,
 		mp_join : 1,
 		backup : 1,
+		request_bkup : 1,
 		csum_reqd : 1,
 		allow_join_id0 : 1;
 	u8	local_id;
diff --git a/net/mptcp/subflow.c b/net/mptcp/subflow.c
index f96363d83e67..2fdc7b1d2f32 100644
--- a/net/mptcp/subflow.c
+++ b/net/mptcp/subflow.c
@@ -1766,6 +1766,7 @@ static void subflow_ulp_clone(const struct request_sock *req,
 		new_ctx->mp_join = 1;
 		new_ctx->fully_established = 1;
 		new_ctx->backup = subflow_req->backup;
+		new_ctx->request_bkup = subflow_req->request_bkup;
 		new_ctx->local_id = subflow_req->local_id;
 		new_ctx->remote_id = subflow_req->remote_id;
 		new_ctx->token = subflow_req->token;