diff --git a/ArduPlane/ArduPlane.cpp b/ArduPlane/ArduPlane.cpp
index 8a727950df215..de009477ce6fc 100644
--- a/ArduPlane/ArduPlane.cpp
+++ b/ArduPlane/ArduPlane.cpp
@@ -262,6 +262,8 @@ void Plane::one_second_loop()
     adsb.set_stall_speed_cm(aparm.airspeed_min);
     adsb.set_max_speed(aparm.airspeed_max);
 
+    ahrs.writeDefaultAirSpeed(0.01f * (float)((aparm.airspeed_min + aparm.airspeed_max)/2));
+
     // sync MAVLink system ID
     mavlink_system.sysid = g.sysid_this_mav;