diff --git a/contrib/checkbox-ce-oem/checkbox-provider-ce-oem/bin/serial_test.py b/contrib/checkbox-ce-oem/checkbox-provider-ce-oem/bin/serial_test.py
index b4047ff419..af5e3e8c29 100755
--- a/contrib/checkbox-ce-oem/checkbox-provider-ce-oem/bin/serial_test.py
+++ b/contrib/checkbox-ce-oem/checkbox-provider-ce-oem/bin/serial_test.py
@@ -15,7 +15,6 @@
 import sys
 import argparse
 import serial
-import serial.rs485
 import time
 import logging
 import os
@@ -89,8 +88,6 @@ def serial_init(self, node: str) -> serial.Serial:
             stopbits=self.stopbits,
             timeout=self.timeout,
         )
-        if self.type == "RS485":
-            ser.rs485_mode = serial.rs485.RS485Settings()
         ser.reset_input_buffer()
         ser.reset_output_buffer()
         return ser