diff --git a/ArduSub/GCS_Mavlink.cpp b/ArduSub/GCS_Mavlink.cpp
index 9e8d732285..c89a54e9fa 100644
--- a/ArduSub/GCS_Mavlink.cpp
+++ b/ArduSub/GCS_Mavlink.cpp
@@ -390,7 +390,9 @@ static const ap_message STREAM_EXTRA3_msgs[] = {
 #if AP_BATTERY_ENABLED
     MSG_BATTERY_STATUS,
 #endif
+#if HAL_MOUNT_ENABLED
     MSG_GIMBAL_DEVICE_ATTITUDE_STATUS,
+#endif
     MSG_OPTICAL_FLOW,
 #if COMPASS_CAL_ENABLED
     MSG_MAG_CAL_REPORT,