diff --git a/libraries/AP_Arming/AP_Arming.cpp b/libraries/AP_Arming/AP_Arming.cpp
index 1646180b53c78..af7dc98d1ecc7 100644
--- a/libraries/AP_Arming/AP_Arming.cpp
+++ b/libraries/AP_Arming/AP_Arming.cpp
@@ -17,6 +17,7 @@
 #include <AP_HAL/AP_HAL.h>
 #include <AP_BoardConfig/AP_BoardConfig.h>
 #include <AP_BattMonitor/AP_BattMonitor.h>
+#include <AP_Compass/AP_Compass.h>
 #include <AP_Notify/AP_Notify.h>
 #include <GCS_MAVLink/GCS.h>
 #include <GCS_MAVLink/GCS_MAVLink.h>