diff --git a/components/openthread/src/port/esp_openthread_uart.c b/components/openthread/src/port/esp_openthread_uart.c
index 685e2ee5586..26c9ed13de6 100644
--- a/components/openthread/src/port/esp_openthread_uart.c
+++ b/components/openthread/src/port/esp_openthread_uart.c
@@ -60,12 +60,10 @@ otError otPlatUartSend(const uint8_t *buf, uint16_t buf_length)
     usb_serial_jtag_ll_txfifo_flush();
 #endif
 
+    otPlatUartSendDone();
     if (rval != (int)buf_length) {
         return OT_ERROR_FAILED;
     }
-
-    otPlatUartSendDone();
-
     return OT_ERROR_NONE;
 }
 #endif