-#include "unit.h"
-
-DBusHandlerResult bus_timer_message_handler(Unit *u, DBusConnection *c, DBusMessage *message);
-
-extern const char bus_timer_interface[];
-extern const char bus_timer_invalidating_properties[];
+extern const sd_bus_vtable bus_timer_vtable[];
+extern const char* const bus_timer_changing_properties[];