diff --git a/libraries/AP_Compass/AP_Compass_Calibration.cpp b/libraries/AP_Compass/AP_Compass_Calibration.cpp
index 1b416cb796..e156ec433a 100644
--- a/libraries/AP_Compass/AP_Compass_Calibration.cpp
+++ b/libraries/AP_Compass/AP_Compass_Calibration.cpp
@@ -3,6 +3,7 @@
 #include <AP_GPS/AP_GPS.h>
 #include <GCS_MAVLink/GCS.h>
 #include <AP_AHRS/AP_AHRS.h>
+#include <AP_InternalError/AP_InternalError.h>
 
 #include "AP_Compass.h"
 
diff --git a/libraries/AP_Compass/CompassCalibrator.cpp b/libraries/AP_Compass/CompassCalibrator.cpp
index e252a28e6b..71c3b3230a 100644
--- a/libraries/AP_Compass/CompassCalibrator.cpp
+++ b/libraries/AP_Compass/CompassCalibrator.cpp
@@ -64,6 +64,7 @@
 #include <AP_AHRS/AP_AHRS.h>
 #include <AP_GPS/AP_GPS.h>
 #include <GCS_MAVLink/GCS.h>
+#include <AP_InternalError/AP_InternalError.h>
 
 #define FIELD_RADIUS_MIN 150
 #define FIELD_RADIUS_MAX 950