diff --git a/libraries/AP_HAL_AVR/examples/I2CDriver_HMC5883L/I2CDriver_HMC5883L.pde b/libraries/AP_HAL_AVR/examples/I2CDriver_HMC5883L/I2CDriver_HMC5883L.pde
index 048e08e64d..3dcec23462 100644
--- a/libraries/AP_HAL_AVR/examples/I2CDriver_HMC5883L/I2CDriver_HMC5883L.pde
+++ b/libraries/AP_HAL_AVR/examples/I2CDriver_HMC5883L/I2CDriver_HMC5883L.pde
@@ -5,7 +5,9 @@
 *******************************************/
 
 #include <AP_Common.h>
+#include <AP_Param.h>
 #include <AP_HAL.h>
+#include <AP_Math.h>
 #include <AP_HAL_AVR.h>
 
 const AP_HAL_AVR::HAL_AVR& hal = AP_HAL_AVR_APM2;