diff --git a/libraries/AP_HAL_SITL/SITL_State.h b/libraries/AP_HAL_SITL/SITL_State.h
index 8c13d95dc0..816f3e6f2d 100644
--- a/libraries/AP_HAL_SITL/SITL_State.h
+++ b/libraries/AP_HAL_SITL/SITL_State.h
@@ -16,13 +16,13 @@
 #include <netinet/udp.h>
 #include <arpa/inet.h>
 
-#include "../AP_Baro/AP_Baro.h"
-#include "../AP_InertialSensor/AP_InertialSensor.h"
-#include "../AP_Compass/Compass.h"
-#include "../AP_OpticalFlow/AP_OpticalFlow.h"
-#include "../AP_Terrain/AP_Terrain.h"
-#include "../SITL/SITL.h"
-#include "../SITL/SIM_Gimbal.h"
+#include <AP_Baro/AP_Baro.h>
+#include <AP_InertialSensor/AP_InertialSensor.h>
+#include <AP_Compass/Compass.h>
+#include <AP_OpticalFlow/AP_OpticalFlow.h>
+#include <AP_Terrain/AP_Terrain.h>
+#include <SITL/SITL.h>
+#include <SITL/SIM_Gimbal.h>
 
 class HAL_SITL;
 
diff --git a/libraries/AP_HAL_SITL/sitl_compass.cpp b/libraries/AP_HAL_SITL/sitl_compass.cpp
index 8d5fa5c200..5f2d33b5b0 100644
--- a/libraries/AP_HAL_SITL/sitl_compass.cpp
+++ b/libraries/AP_HAL_SITL/sitl_compass.cpp
@@ -14,9 +14,9 @@
 #include "HAL_SITL_Class.h"
 
 #include <AP_Math/AP_Math.h>
-#include "../AP_Compass/AP_Compass.h"
-#include "../AP_Declination/AP_Declination.h"
-#include "../SITL/SITL.h"
+#include <AP_Compass/AP_Compass.h>
+#include <AP_Declination/AP_Declination.h>
+#include <SITL/SITL.h>
 
 extern const AP_HAL::HAL& hal;
 
diff --git a/libraries/AP_HAL_SITL/sitl_gps.cpp b/libraries/AP_HAL_SITL/sitl_gps.cpp
index 6fbca498fc..4d3a053d50 100644
--- a/libraries/AP_HAL_SITL/sitl_gps.cpp
+++ b/libraries/AP_HAL_SITL/sitl_gps.cpp
@@ -15,11 +15,11 @@
 #include "HAL_SITL_Class.h"
 
 #include <AP_Math/AP_Math.h>
-#include "../SITL/SITL.h"
+#include <SITL/SITL.h>
 #include "Scheduler.h"
 #include "UARTDriver.h"
-#include "../AP_GPS/AP_GPS.h"
-#include "../AP_GPS/AP_GPS_UBLOX.h"
+#include <AP_GPS/AP_GPS.h>
+#include <AP_GPS/AP_GPS_UBLOX.h>
 #include <sys/ioctl.h>
 #include <unistd.h>
 #include <time.h>
diff --git a/libraries/AP_HAL_SITL/sitl_ins.cpp b/libraries/AP_HAL_SITL/sitl_ins.cpp
index 2f77957cfd..49b1b779c7 100644
--- a/libraries/AP_HAL_SITL/sitl_ins.cpp
+++ b/libraries/AP_HAL_SITL/sitl_ins.cpp
@@ -14,13 +14,13 @@
 #include "HAL_SITL_Class.h"
 
 #include <AP_Math/AP_Math.h>
-#include "../AP_Compass/AP_Compass.h"
-#include "../AP_Declination/AP_Declination.h"
-#include "../AP_RangeFinder/AP_RangeFinder.h"
-#include "../SITL/SITL.h"
+#include <AP_Compass/AP_Compass.h>
+#include <AP_Declination/AP_Declination.h>
+#include <AP_RangeFinder/AP_RangeFinder.h>
+#include <SITL/SITL.h>
 #include "Scheduler.h"
 #include <AP_Math/AP_Math.h>
-#include "../AP_ADC/AP_ADC.h"
+#include <AP_ADC/AP_ADC.h>
 #include "SITL_State.h"
 #include <fenv.h>