diff --git a/libraries/AP_Compass/AP_Compass_AK8963.cpp b/libraries/AP_Compass/AP_Compass_AK8963.cpp
index fce8a11363..b94698fbe1 100644
--- a/libraries/AP_Compass/AP_Compass_AK8963.cpp
+++ b/libraries/AP_Compass/AP_Compass_AK8963.cpp
@@ -17,7 +17,6 @@
 
 #include <AP_Math/AP_Math.h>
 #include <AP_HAL/AP_HAL.h>
-#include <AP_Common/Semaphore.h>
 
 #include "AP_Compass_AK8963.h"
 #include <AP_InertialSensor/AP_InertialSensor_Invensense.h>
diff --git a/libraries/AP_Compass/AP_Compass_Backend.cpp b/libraries/AP_Compass/AP_Compass_Backend.cpp
index 94d71f2252..315086007f 100644
--- a/libraries/AP_Compass/AP_Compass_Backend.cpp
+++ b/libraries/AP_Compass/AP_Compass_Backend.cpp
@@ -3,7 +3,6 @@
 #include "AP_Compass.h"
 #include "AP_Compass_Backend.h"
 
-#include <AP_Common/Semaphore.h>
 #include <stdio.h>
 
 extern const AP_HAL::HAL& hal;
diff --git a/libraries/AP_Compass/AP_Compass_SITL.cpp b/libraries/AP_Compass/AP_Compass_SITL.cpp
index 76276a9baa..ed110bc0b1 100644
--- a/libraries/AP_Compass/AP_Compass_SITL.cpp
+++ b/libraries/AP_Compass/AP_Compass_SITL.cpp
@@ -1,7 +1,6 @@
 #include "AP_Compass_SITL.h"
 
 #include <AP_HAL/AP_HAL.h>
-#include <AP_Common/Semaphore.h>
 
 #if CONFIG_HAL_BOARD == HAL_BOARD_SITL
 extern const AP_HAL::HAL& hal;
diff --git a/libraries/AP_Compass/AP_Compass_UAVCAN.cpp b/libraries/AP_Compass/AP_Compass_UAVCAN.cpp
index db635a5395..e9ee85f87e 100644
--- a/libraries/AP_Compass/AP_Compass_UAVCAN.cpp
+++ b/libraries/AP_Compass/AP_Compass_UAVCAN.cpp
@@ -20,7 +20,6 @@
 #include "AP_Compass_UAVCAN.h"
 
 #include <AP_BoardConfig/AP_BoardConfig_CAN.h>
-#include <AP_Common/Semaphore.h>
 #include <AP_UAVCAN/AP_UAVCAN.h>
 
 #include <uavcan/equipment/ahrs/MagneticFieldStrength.hpp>