diff --git a/lib/max31855.py b/lib/max31855.py
index 0d76704..a2f249c 100644
--- a/lib/max31855.py
+++ b/lib/max31855.py
@@ -1,5 +1,6 @@
 #!/usr/bin/python
 import RPi.GPIO as GPIO
+import math
 
 class MAX31855(object):
     '''Python driver for [MAX38155 Cold-Junction Compensated Thermocouple-to-Digital Converter](http://www.maximintegrated.com/datasheet/index.mvp/id/7273)