diff --git a/libraries/GCS_MAVLink/ap_message.h b/libraries/GCS_MAVLink/ap_message.h
index d041127dfa..2d6761db8f 100644
--- a/libraries/GCS_MAVLink/ap_message.h
+++ b/libraries/GCS_MAVLink/ap_message.h
@@ -6,6 +6,8 @@
 
 #pragma once
 
+#include "GCS_config.h"
+
 #include <AP_AHRS/AP_AHRS_config.h>
 
 enum ap_message : uint8_t {