diff --git a/components/bt/esp_ble_mesh/core/transport.c b/components/bt/esp_ble_mesh/core/transport.c
index 204854e241..8c5319b717 100644
--- a/components/bt/esp_ble_mesh/core/transport.c
+++ b/components/bt/esp_ble_mesh/core/transport.c
@@ -2105,9 +2105,9 @@ void bt_mesh_trans_init(void)
 #if CONFIG_BLE_MESH_LONG_PACKET
     for (i = 0; i < ARRAY_SIZE(ext_seg_rx); i++) {
         k_delayed_work_init(&ext_seg_rx[i].ack_timer, seg_ack);
-        ext_seg_rx[i].buf.size = CONFIG_BLE_MESH_LONG_PACKET_ADV_LEN;
+        ext_seg_rx[i].buf.size = BLE_MESH_EXT_RX_SDU_MAX;
         ext_seg_rx[i].buf.__buf = (ext_seg_rx_buf_data +
-                                (i * CONFIG_BLE_MESH_LONG_PACKET_ADV_LEN));
+                                (i * BLE_MESH_EXT_RX_SDU_MAX));
         ext_seg_rx[i].buf.data = ext_seg_rx[i].buf.__buf;
     }
 #endif
diff --git a/components/bt/esp_ble_mesh/core/transport.enh.c b/components/bt/esp_ble_mesh/core/transport.enh.c
index 967b523379..d1e054000d 100644
--- a/components/bt/esp_ble_mesh/core/transport.enh.c
+++ b/components/bt/esp_ble_mesh/core/transport.enh.c
@@ -2723,9 +2723,9 @@ void bt_mesh_trans_init(void)
 
 #if CONFIG_BLE_MESH_LONG_PACKET
     for (i = 0; i < ARRAY_SIZE(ext_seg_rx); i++) {
-        ext_seg_rx[i].buf.size = CONFIG_BLE_MESH_LONG_PACKET_ADV_LEN;
+        ext_seg_rx[i].buf.size = BLE_MESH_EXT_RX_SDU_MAX;
         ext_seg_rx[i].buf.__buf = (ext_seg_rx_buf_data +
-                                (i * CONFIG_BLE_MESH_LONG_PACKET_ADV_LEN));
+                                (i * BLE_MESH_EXT_RX_SDU_MAX));
         ext_seg_rx[i].buf.data = ext_seg_rx[i].buf.__buf;
     }
 #endif