diff --git a/libraries/SITL/SIM_GPS.cpp b/libraries/SITL/SIM_GPS.cpp
index f95d5922c31dfe..290b432c233d34 100644
--- a/libraries/SITL/SIM_GPS.cpp
+++ b/libraries/SITL/SIM_GPS.cpp
@@ -11,6 +11,7 @@
 #if HAL_SIM_GPS_ENABLED
 
 #include <time.h>
+#include <sys/time.h>
 
 #include <AP_BoardConfig/AP_BoardConfig.h>
 #include <AP_HAL/AP_HAL.h>
diff --git a/libraries/SITL/SIM_GPS.h b/libraries/SITL/SIM_GPS.h
index 954bbd45acef34..9f5e226b397c24 100644
--- a/libraries/SITL/SIM_GPS.h
+++ b/libraries/SITL/SIM_GPS.h
@@ -27,6 +27,7 @@ param set SERIAL5_PROTOCOL 5
 
 #if HAL_SIM_GPS_ENABLED
 
+#include <sys/time.h>
 #include "SIM_SerialDevice.h"
 
 namespace SITL {
diff --git a/libraries/SITL/SIM_GPS_MSP.cpp b/libraries/SITL/SIM_GPS_MSP.cpp
index 2bf9db476f0bc0..65d8838b7d6d97 100644
--- a/libraries/SITL/SIM_GPS_MSP.cpp
+++ b/libraries/SITL/SIM_GPS_MSP.cpp
@@ -7,6 +7,7 @@
 #include <SITL/SITL.h>
 
 #include <time.h>
+#include <sys/time.h>
 
 using namespace SITL;
 
diff --git a/libraries/SITL/SIM_GPS_NMEA.cpp b/libraries/SITL/SIM_GPS_NMEA.cpp
index bda820cabfbddf..30c705382e1521 100644
--- a/libraries/SITL/SIM_GPS_NMEA.cpp
+++ b/libraries/SITL/SIM_GPS_NMEA.cpp
@@ -9,6 +9,7 @@
 #include <AP_HAL/AP_HAL.h>
 
 #include <time.h>
+#include <sys/time.h>
 
 extern const AP_HAL::HAL& hal;
 
diff --git a/libraries/SITL/SIM_MicroStrain.cpp b/libraries/SITL/SIM_MicroStrain.cpp
index d56cc87fce4c11..7cbff8263cb483 100644
--- a/libraries/SITL/SIM_MicroStrain.cpp
+++ b/libraries/SITL/SIM_MicroStrain.cpp
@@ -25,6 +25,7 @@
 */
 #include "SIM_MicroStrain.h"
 #include <stdio.h>
+#include <sys/time.h>
 #include <unistd.h>
 #include <fcntl.h>
 #include <AP_HAL/utility/sparse-endian.h>
diff --git a/libraries/SITL/SIM_MicroStrain.h b/libraries/SITL/SIM_MicroStrain.h
index 80684f1ef48920..84e3b261bc1bc4 100644
--- a/libraries/SITL/SIM_MicroStrain.h
+++ b/libraries/SITL/SIM_MicroStrain.h
@@ -6,6 +6,7 @@
 
 #include <SITL/SITL.h>
 #include "SIM_SerialDevice.h"
+#include <sys/time.h>
 
 namespace SITL
 {
diff --git a/libraries/SITL/SIM_VectorNav.cpp b/libraries/SITL/SIM_VectorNav.cpp
index ad61f0101077e3..545445da46d40f 100644
--- a/libraries/SITL/SIM_VectorNav.cpp
+++ b/libraries/SITL/SIM_VectorNav.cpp
@@ -18,6 +18,7 @@
 
 #include "SIM_VectorNav.h"
 #include <stdio.h>
+#include <sys/time.h>
 #include <unistd.h>
 #include <fcntl.h>
 #include <AP_Common/NMEA.h>