diff --git a/ArduSub/GCS_Mavlink.cpp b/ArduSub/GCS_Mavlink.cpp
index 06fca7c1a1..1ffb5f0419 100644
--- a/ArduSub/GCS_Mavlink.cpp
+++ b/ArduSub/GCS_Mavlink.cpp
@@ -1397,7 +1397,7 @@ void GCS_MAVLINK_Sub::handleMessage(mavlink_message_t* msg)
         }
 
         default:
-            result = MAV_RESULT_UNSUPPORTED;
+            result = handle_command_long_message(packet);
             break;
         }