diff --git a/libraries/AP_Airspeed/AP_Airspeed_Backend.h b/libraries/AP_Airspeed/AP_Airspeed_Backend.h
index b7c2f9b44c..73248d6802 100644
--- a/libraries/AP_Airspeed/AP_Airspeed_Backend.h
+++ b/libraries/AP_Airspeed/AP_Airspeed_Backend.h
@@ -19,7 +19,6 @@
  */
 
 #include <AP_Common/AP_Common.h>
-#include <AP_Common/Semaphore.h>
 #include <AP_HAL/AP_HAL.h>
 #include "AP_Airspeed.h"