diff --git a/lib/pbio/drv/ioport/ioport_lpf2.c b/lib/pbio/drv/ioport/ioport_lpf2.c
index 1fb07c2f7..d9b2cc893 100644
--- a/lib/pbio/drv/ioport/ioport_lpf2.c
+++ b/lib/pbio/drv/ioport/ioport_lpf2.c
@@ -508,6 +508,7 @@ PROCESS_THREAD(pbdrv_ioport_lpf2_process, ev, data) {
                     if (ioport->connected_type_id == PBIO_IODEV_TYPE_ID_LPF2_UNKNOWN_UART) {
                         ioport_enable_uart(ioport);
                         pbio_uartdev_get(i, &ioport->iodev);
+                        ioport->iodev->port = i + PBDRV_CONFIG_FIRST_IO_PORT;
                     } else if (ioport->connected_type_id == PBIO_IODEV_TYPE_ID_NONE) {
                         ioport->iodev = NULL;
                     } else {