diff --git a/Tools/scripts/sitl-on-hardware/extra-hwdef-sitl-on-hw.dat b/Tools/scripts/sitl-on-hardware/extra-hwdef-sitl-on-hw.dat
index fd766ad7dd..0b81cc3e77 100644
--- a/Tools/scripts/sitl-on-hardware/extra-hwdef-sitl-on-hw.dat
+++ b/Tools/scripts/sitl-on-hardware/extra-hwdef-sitl-on-hw.dat
@@ -1,8 +1,5 @@
 env SIM_ENABLED 1
 
-define INS_MAX_INSTANCES 2
-define HAL_COMPASS_MAX_SENSORS 2
-
 define AP_GPS_BACKEND_DEFAULT_ENABLED 0
 define AP_RANGEFINDER_BACKEND_DEFAULT_ENABLED 0
 
diff --git a/Tools/scripts/sitl-on-hardware/plane-extra-hwdef-sitl-on-hw.dat b/Tools/scripts/sitl-on-hardware/plane-extra-hwdef-sitl-on-hw.dat
index 27868fd515..145ffbcf8b 100644
--- a/Tools/scripts/sitl-on-hardware/plane-extra-hwdef-sitl-on-hw.dat
+++ b/Tools/scripts/sitl-on-hardware/plane-extra-hwdef-sitl-on-hw.dat
@@ -1,8 +1,5 @@
 env SIM_ENABLED 1
 
-define INS_MAX_INSTANCES 2
-define HAL_COMPASS_MAX_SENSORS 2
-
 define AP_GPS_BACKEND_DEFAULT_ENABLED 0
 define AP_RANGEFINDER_BACKEND_DEFAULT_ENABLED 0