diff --git a/libraries/AP_InertialSensor/AP_InertialSensor.h b/libraries/AP_InertialSensor/AP_InertialSensor.h
index 2c84bb3daf..02f41f2c53 100644
--- a/libraries/AP_InertialSensor/AP_InertialSensor.h
+++ b/libraries/AP_InertialSensor/AP_InertialSensor.h
@@ -39,7 +39,6 @@
 #include <stdint.h>
 
 #include <AP_AccelCal/AP_AccelCal.h>
-#include <AP_HAL/AP_HAL.h>
 #include <AP_HAL/utility/RingBuffer.h>
 #include <AP_Math/AP_Math.h>
 #include <AP_ExternalAHRS/AP_ExternalAHRS.h>