diff --git a/lib/farmbot/firmware/uart_handler/auto_detector.ex b/lib/farmbot/firmware/uart_handler/auto_detector.ex
index a0c23662..b9279746 100644
--- a/lib/farmbot/firmware/uart_handler/auto_detector.ex
+++ b/lib/farmbot/firmware/uart_handler/auto_detector.ex
@@ -33,7 +33,7 @@ defmodule Farmbot.Firmware.UartHandler.AutoDetector do
       [dev] ->
         Logger.success 3, "detected target UART: #{dev}"
         update_fw_handler UartHandler
-        Application.put_env(:farmbot, :uart_handler, tty: "/dev/ttyACM0")
+        Application.put_env(:farmbot, :uart_handler, tty: dev)
       _ ->
         Logger.error 1, "Could not detect a UART device."
         update_fw_handler StubHandler