diff --git a/rpitx.py b/rpitx.py
index 7dae4a13..5a3353ae 100644
--- a/rpitx.py
+++ b/rpitx.py
@@ -4,6 +4,7 @@ import RPi.GPIO as GPIO
 import subprocess
 import time
 import os
+import sys
 
 GPIO.setmode(GPIO.BCM)
 GPIO.setup(27, GPIO.IN, pull_up_down=GPIO.PUD_UP)