diff --git a/src/newgrf_sound.cpp b/src/newgrf_sound.cpp
--- a/src/newgrf_sound.cpp
+++ b/src/newgrf_sound.cpp
@@ -3,11 +3,7 @@
 /** @file newgrf_sound.cpp Handling NewGRF provided sounds. */
 
 #include "stdafx.h"
-#include "openttd.h"
-#include "oldpool.h"
-#include "engine_func.h"
 #include "engine_base.h"
-#include "newgrf_callbacks.h"
 #include "newgrf_engine.h"
 #include "newgrf_sound.h"
 #include "vehicle_base.h"