diff --git a/books/beaglebone-cookbook/02sensors/sensors.rst b/books/beaglebone-cookbook/02sensors/sensors.rst
index 9ddb94d79b28ffc5a82756319499fce41621233a..6f15d0adf0c28d3db2271194a7b51c1b3a786cdc 100644
--- a/books/beaglebone-cookbook/02sensors/sensors.rst
+++ b/books/beaglebone-cookbook/02sensors/sensors.rst
@@ -648,7 +648,7 @@ Solution
 The TMP101 sensor is a common digital temperature 
 sensor that uses a standard |I2C|-based serial protocol.
 
-.. |I2C| replace:: I\ :sub:`2`\ C
+.. |I2C| replace:: I\ :sup:`2`\ C
 
 To make this recipe, you will need: