diff --git a/net/mptcp/protocol.h b/net/mptcp/protocol.h
index 987046d9d1d4d..5c45aabf4c6a6 100644
--- a/net/mptcp/protocol.h
+++ b/net/mptcp/protocol.h
@@ -578,10 +578,14 @@ static inline bool mptcp_pm_should_rm_signal(struct mptcp_sock *msk)
 
 static inline unsigned int mptcp_add_addr_len(int family, bool echo)
 {
-	if (family == AF_INET)
-		return echo ? TCPOLEN_MPTCP_ADD_ADDR_BASE
-			    : TCPOLEN_MPTCP_ADD_ADDR;
-	return echo ? TCPOLEN_MPTCP_ADD_ADDR6_BASE : TCPOLEN_MPTCP_ADD_ADDR6;
+	u8 len = TCPOLEN_MPTCP_ADD_ADDR_BASE;
+
+	if (family == AF_INET6)
+		len = TCPOLEN_MPTCP_ADD_ADDR6_BASE;
+	if (!echo)
+		len += MPTCPOPT_THMAC_LEN;
+
+	return len;
 }
 
 bool mptcp_pm_add_addr_signal(struct mptcp_sock *msk, unsigned int remaining,