diff --git a/controller/controller.py b/controller/controller.py
index f1b82b3..ae37883 100644
--- a/controller/controller.py
+++ b/controller/controller.py
@@ -17,7 +17,7 @@ else:
 
 # Try to grab a sensor reading.  Use the read_retry method which will retry up
 # to 15 times to get a sensor reading (waiting 2 seconds between each retry).
-humidity, temperature = Adafruit_DHT.read_retry(sensor, pin)
+humidity, temperature = Adafruit_DHT.read_retry(SENSOR_TYPE, GPIO_PIN)
 
 # Un-comment the line below to convert the temperature to Fahrenheit.
 # temperature = temperature * 9/5.0 + 32