diff --git a/Adafruit_10DOF.cpp b/Adafruit_10DOF.cpp
index 97d1b34..ed3dad1 100644
--- a/Adafruit_10DOF.cpp
+++ b/Adafruit_10DOF.cpp
@@ -20,7 +20,7 @@
 
 #include <Wire.h>
 #include <limits.h>
-#include <Math.h>
+#include <math.h>
 
 #include "Adafruit_10DOF.h"
 
diff --git a/cosmicpi-arduino.ino b/cosmicpi-arduino.ino
index 0061d1d..880da54 100644
--- a/cosmicpi-arduino.ino
+++ b/cosmicpi-arduino.ino
@@ -74,6 +74,7 @@
 
 #include <time.h>
 #include <Wire.h>
+#include <math.h>
 
 #include "Adafruit_BMP085_U.h"	// Barrometric pressure