diff --git a/libraries/AP_HAL_Empty/AP_HAL_Empty_Private.h b/libraries/AP_HAL_Empty/AP_HAL_Empty_Private.h
index 12742bce84..e38731a4be 100644
--- a/libraries/AP_HAL_Empty/AP_HAL_Empty_Private.h
+++ b/libraries/AP_HAL_Empty/AP_HAL_Empty_Private.h
@@ -6,19 +6,19 @@
  * Only import this header from inside AP_HAL_Empty
  */
 
-#include "UARTDriver.h"
-#include "I2CDriver.h"
-#include "SPIDriver.h"
 #include "AnalogIn.h"
-#include "Storage.h"
 #include "GPIO.h"
+#include "I2CDriver.h"
+#include "OpticalFlow.h"
+#include "PrivateMember.h"
 #include "RCInput.h"
 #include "RCOutput.h"
-#include "Semaphores.h"
 #include "Scheduler.h"
+#include "Semaphores.h"
+#include "SPIDriver.h"
+#include "Storage.h"
+#include "UARTDriver.h"
 #include "Util.h"
-#include "OpticalFlow.h"
-#include "PrivateMember.h"
 
 #endif // __AP_HAL_EMPTY_PRIVATE_H__