diff --git a/libraries/AP_Vehicle/ModeReason.h b/libraries/AP_Vehicle/ModeReason.h
index daa5453e0a..d1e124426f 100644
--- a/libraries/AP_Vehicle/ModeReason.h
+++ b/libraries/AP_Vehicle/ModeReason.h
@@ -69,4 +69,5 @@ enum class ModeReason : uint8_t {
   QLAND_INSTEAD_OF_RTL = 49,
   DEADRECKON_FAILSAFE = 50,
   MODE_TAKEOFF_FAILSAFE = 51,
+  DDS_COMMAND = 52,
 };