diff --git a/components/bt/esp_ble_mesh/mesh_core/transport.c b/components/bt/esp_ble_mesh/mesh_core/transport.c
index 62d3a67ab1..cc070d5639 100644
--- a/components/bt/esp_ble_mesh/mesh_core/transport.c
+++ b/components/bt/esp_ble_mesh/mesh_core/transport.c
@@ -371,7 +371,7 @@ static int send_seg(struct bt_mesh_net_tx *net_tx, struct net_buf_simple *sdu,
         tx->ttl = net_tx->ctx->send_ttl;
     }
 
-    seq_zero = tx->seq_auth & 0x1fff;
+    seq_zero = tx->seq_auth & TRANS_SEQ_ZERO_MASK;
 
     BT_DBG("SeqZero 0x%04x", seq_zero);
 
@@ -780,7 +780,7 @@ static struct seg_tx *seg_tx_lookup(u16_t seq_zero, u8_t obo, u16_t addr)
     for (i = 0; i < ARRAY_SIZE(seg_tx); i++) {
         tx = &seg_tx[i];
 
-        if ((tx->seq_auth & 0x1fff) != seq_zero) {
+        if ((tx->seq_auth & TRANS_SEQ_ZERO_MASK) != seq_zero) {
             continue;
         }
 
@@ -818,7 +818,7 @@ static int trans_ack(struct bt_mesh_net_rx *rx, u8_t hdr,
 
     seq_zero = net_buf_simple_pull_be16(buf);
     obo = seq_zero >> 15;
-    seq_zero = (seq_zero >> 2) & 0x1fff;
+    seq_zero = (seq_zero >> 2) & TRANS_SEQ_ZERO_MASK;
 
     if (IS_ENABLED(CONFIG_BLE_MESH_FRIEND) && rx->friend_match) {
         BT_DBG("Ack for LPN 0x%04x of this Friend", rx->ctx.recv_dst);
@@ -1079,7 +1079,7 @@ static int send_ack(struct bt_mesh_subnet *sub, u16_t src, u16_t dst,
         .src = obo ? bt_mesh_primary_addr() : src,
         .xmit = bt_mesh_net_transmit_get(),
     };
-    u16_t seq_zero = *seq_auth & 0x1fff;
+    u16_t seq_zero = *seq_auth & TRANS_SEQ_ZERO_MASK;
     u8_t buf[6];
 
     BT_DBG("SeqZero 0x%04x Block 0x%08x OBO %u", seq_zero, block, obo);
@@ -1287,7 +1287,7 @@ static int trans_seg(struct net_buf_simple *buf, struct bt_mesh_net_rx *net_rx,
 
     seq_zero = net_buf_simple_pull_be16(buf);
     seg_o = (seq_zero & 0x03) << 3;
-    seq_zero = (seq_zero >> 2) & 0x1fff;
+    seq_zero = (seq_zero >> 2) & TRANS_SEQ_ZERO_MASK;
     seg_n = net_buf_simple_pull_u8(buf);
     seg_o |= seg_n >> 5;
     seg_n &= 0x1f;
diff --git a/components/bt/esp_ble_mesh/mesh_core/transport.h b/components/bt/esp_ble_mesh/mesh_core/transport.h
index 50a7aae1e8..87953f2edd 100644
--- a/components/bt/esp_ble_mesh/mesh_core/transport.h
+++ b/components/bt/esp_ble_mesh/mesh_core/transport.h
@@ -14,6 +14,7 @@
 
 #define BLE_MESH_TX_SDU_MAX            (CONFIG_BLE_MESH_TX_SEG_MAX * 12)
 
+#define TRANS_SEQ_ZERO_MASK            ((u16_t)BIT_MASK(13))
 #define TRANS_CTL_OP_MASK              ((u8_t)BIT_MASK(7))
 #define TRANS_CTL_OP(data)             ((data)[0] & TRANS_CTL_OP_MASK)
 #define TRANS_CTL_HDR(op, seg)         ((op & TRANS_CTL_OP_MASK) | (seg << 7))