diff --git a/libraries/SITL/SITL.cpp b/libraries/SITL/SITL.cpp
index ad4a2f4c50..9dc49f4af2 100644
--- a/libraries/SITL/SITL.cpp
+++ b/libraries/SITL/SITL.cpp
@@ -77,7 +77,7 @@ const AP_Param::GroupInfo SITL::var_info[] = {
     AP_GROUPINFO("ARSPD_FAIL",    43, SITL,  arspd_fail, 0),
     AP_GROUPINFO("GYR_SCALE",     44, SITL,  gyro_scale, 0),
     AP_GROUPINFO("ADSB_COUNT",    45, SITL,  adsb_plane_count, -1),
-    AP_GROUPINFO("ADSB_RADIUS",   46, SITL,  adsb_radius_m, 1000),
+    AP_GROUPINFO("ADSB_RADIUS",   46, SITL,  adsb_radius_m, 10000),
     AP_GROUPINFO("ADSB_ALT",      47, SITL,  adsb_altitude_m, 1000),
     AP_GROUPINFO("MAG_ALY",       48, SITL,  mag_anomaly_ned, 0),
     AP_GROUPINFO("MAG_ALY_HGT",   49, SITL,  mag_anomaly_hgt, 1.0f),