diff --git a/components/freemodbus/port/portserial.c b/components/freemodbus/port/portserial.c
index ccbb4bd284..d3f1455313 100644
--- a/components/freemodbus/port/portserial.c
+++ b/components/freemodbus/port/portserial.c
@@ -120,7 +120,7 @@ BOOL xMBPortSerialTxPoll(void)
         }
         ESP_LOGD(TAG, "MB_TX_buffer send: (%d) bytes\n", (uint16_t)usCount);
         // Waits while UART sending the packet
-        esp_err_t xTxStatus = uart_wait_tx_done(ucUartNumber, MB_SERIAL_TX_TOUT_TICKS);
+        esp_err_t xTxStatus = uart_wait_tx_idle_polling(ucUartNumber);
         vMBPortSerialEnable(TRUE, FALSE);
         MB_PORT_CHECK((xTxStatus == ESP_OK), FALSE, "mb serial sent buffer failure.");
         return TRUE;
diff --git a/components/freemodbus/port/portserial_m.c b/components/freemodbus/port/portserial_m.c
index 80c2306c33..8bcd0f012a 100644
--- a/components/freemodbus/port/portserial_m.c
+++ b/components/freemodbus/port/portserial_m.c
@@ -122,8 +122,8 @@ BOOL xMBMasterPortSerialTxPoll(void)
         }
         ESP_LOGD(TAG, "MB_TX_buffer sent: (%d) bytes.", (uint16_t)(usCount - 1));
         // Waits while UART sending the packet
-        esp_err_t xTxStatus = uart_wait_tx_done(ucUartNumber, MB_SERIAL_TX_TOUT_TICKS);
-        vMBMasterPortSerialEnable( TRUE, FALSE );
+        esp_err_t xTxStatus = uart_wait_tx_idle_polling(ucUartNumber);
+        vMBMasterPortSerialEnable(TRUE, FALSE);
         MB_PORT_CHECK((xTxStatus == ESP_OK), FALSE, "mb serial sent buffer failure.");
         return TRUE;
     }