diff --git a/config/generic-duet2-duex.cfg b/config/generic-duet2-duex.cfg
index fb43c78e..0bcff926 100644
--- a/config/generic-duet2-duex.cfg
+++ b/config/generic-duet2-duex.cfg
@@ -321,8 +321,7 @@ pid_Ki: 1.08
 pid_Kd: 114
 
 [mcu]
-serial: /dev/ttyACM0
-restart_method: command
+serial: /dev/serial/by-id/usb-Klipper_Klipper_firmware_12345-if00
 
 [sx1509 duex]
 i2c_address: 62 # Address is fixed on duex boards