diff --git a/libraries/GCS_MAVLink/GCS.h b/libraries/GCS_MAVLink/GCS.h
index 24ce234c68..0157265c6f 100644
--- a/libraries/GCS_MAVLink/GCS.h
+++ b/libraries/GCS_MAVLink/GCS.h
@@ -72,6 +72,7 @@ enum ap_message {
     MSG_ADSB_VEHICLE,
     MSG_BATTERY_STATUS,
     MSG_AOA_SSA,
+    MSG_LANDING,
     MSG_RETRY_DEFERRED // this must be last
 };