diff --git a/ArduSub/Sub.h b/ArduSub/Sub.h
index 28b021a293..df44f20015 100644
--- a/ArduSub/Sub.h
+++ b/ArduSub/Sub.h
@@ -59,7 +59,6 @@
 #include <AC_Fence/AC_Fence.h>           // Fence library
 #include <AP_Scheduler/AP_Scheduler.h>       // main loop scheduler
 #include <AP_Scheduler/PerfInfo.h>       // loop perf monitoring
-#include <AP_Notify/AP_Notify.h>          // Notify library
 #include <AP_BattMonitor/AP_BattMonitor.h>     // Battery monitor library
 #include <AP_Terrain/AP_Terrain.h>
 #include <AP_JSButton/AP_JSButton.h>   // Joystick/gamepad button function assignment