diff --git a/ArduSub/Sub.h b/ArduSub/Sub.h
index 9c565a12ce..1a003f803e 100644
--- a/ArduSub/Sub.h
+++ b/ArduSub/Sub.h
@@ -128,7 +128,7 @@
 #include <SITL/SITL.h>
 #endif
 
-class Sub : public AP_HAL::HAL::Callbacks {
+class Sub : public AP_Vehicle {
 public:
     friend class GCS_MAVLINK_Sub;
     friend class GCS_Sub;