diff --git a/settings.c b/settings.c
--- a/settings.c
+++ b/settings.c
@@ -1,5 +1,6 @@
 #include "stdafx.h"
 #include "openttd.h"
+#include "functions.h"
 #include "screenshot.h"
 #include "sound.h"
 #include "spritecache.h"