diff --git a/message_definitions/v1.0/ardupilotmega.xml b/message_definitions/v1.0/ardupilotmega.xml
index 7c9d2738b8..bbaa166a01 100644
--- a/message_definitions/v1.0/ardupilotmega.xml
+++ b/message_definitions/v1.0/ardupilotmega.xml
@@ -1146,6 +1146,9 @@
       <entry value="25" name="PLANE_MODE_LOITER_ALT_QLAND">
         <description>LOITER2QLAND</description>
       </entry>
+      <entry value="26" name="PLANE_MODE_AUTOLAND">
+        <description>AUTOLAND</description>
+      </entry>
     </enum>
     <enum name="COPTER_MODE">
       <description>A mapping of copter flight modes for custom_mode field of heartbeat.</description>