diff --git a/test.py b/test.py
index 04c007a..2b8db47 100644
--- a/test.py
+++ b/test.py
@@ -16,6 +16,8 @@ global GPIO
 import RPi.GPIO as GPIO
 import time
 
+GPIO.setmode(GPIO.BCM)
+
 GPIO_TRIGGER = 18
 GPIO_ECHO = 24
 GPIO.setup(GPIO_TRIGGER, GPIO.OUT)