diff --git a/ArduSub/GCS_Mavlink.cpp b/ArduSub/GCS_Mavlink.cpp
index 4facb62f80..0315d75ba2 100644
--- a/ArduSub/GCS_Mavlink.cpp
+++ b/ArduSub/GCS_Mavlink.cpp
@@ -346,7 +346,9 @@ static const ap_message STREAM_RAW_SENSORS_msgs[] = {
 static const ap_message STREAM_EXTENDED_STATUS_msgs[] = {
     MSG_SYS_STATUS,
     MSG_POWER_STATUS,
+#if HAL_WITH_MCU_MONITORING
     MSG_MCU_STATUS,
+#endif
     MSG_MEMINFO,
     MSG_CURRENT_WAYPOINT,
     MSG_GPS_RAW,