diff --git a/libraries/AP_OpticalFlow/AP_OpticalFlow.h b/libraries/AP_OpticalFlow/AP_OpticalFlow.h
index 0f83e304ca..5ea0d177d2 100644
--- a/libraries/AP_OpticalFlow/AP_OpticalFlow.h
+++ b/libraries/AP_OpticalFlow/AP_OpticalFlow.h
@@ -31,7 +31,6 @@
  */
 
 #include <AP_MSP/msp.h>
-#include <AP_HAL/AP_HAL.h>
 #include <AP_Math/AP_Math.h>
 #include <GCS_MAVLink/GCS_MAVLink.h>
 #include "AP_OpticalFlow_Calibrator.h"
diff --git a/libraries/AP_OpticalFlow/AP_OpticalFlow_Calibrator.h b/libraries/AP_OpticalFlow/AP_OpticalFlow_Calibrator.h
index 5a169f2ab6..13b9c5c0dc 100644
--- a/libraries/AP_OpticalFlow/AP_OpticalFlow_Calibrator.h
+++ b/libraries/AP_OpticalFlow/AP_OpticalFlow_Calibrator.h
@@ -1,6 +1,5 @@
 #pragma once
 
-#include <AP_HAL/AP_HAL.h>
 #include <AP_Math/AP_Math.h>
 
 #define AP_OPTICALFLOW_CAL_MAX_SAMPLES 50  // number of samples required before calibration begins