diff --git a/ArduSub/Sub.h b/ArduSub/Sub.h
index 42ab278dd7..c4c94b1015 100644
--- a/ArduSub/Sub.h
+++ b/ArduSub/Sub.h
@@ -110,10 +110,6 @@
 #include <AP_Scripting/AP_Scripting.h>
 #endif
 
-#if CONFIG_HAL_BOARD == HAL_BOARD_SITL
-#include <SITL/SITL.h>
-#endif
-
 class Sub : public AP_Vehicle {
 public:
     friend class GCS_MAVLINK_Sub;
@@ -164,10 +160,6 @@ private:
     AP_RPM rpm_sensor;
 #endif
 
-#if CONFIG_HAL_BOARD == HAL_BOARD_SITL
-    SITL::SIM sitl;
-#endif
-
     // Mission library
     AP_Mission mission{
             FUNCTOR_BIND_MEMBER(&Sub::start_command, bool, const AP_Mission::Mission_Command &),