diff --git a/src/sound/null_s.cpp b/src/sound/null_s.cpp
--- a/src/sound/null_s.cpp
+++ b/src/sound/null_s.cpp
@@ -1,7 +1,6 @@
 /* $Id$ */
 
 #include "../stdafx.h"
-#include "../openttd.h"
 #include "null_s.h"
 
 static const char *NullSoundStart(const char * const *parm) { return NULL; }