diff --git a/win32.c b/win32.c
--- a/win32.c
+++ b/win32.c
@@ -1,6 +1,7 @@
 #include "stdafx.h"
 #include "openttd.h"
 #include "debug.h"
+#include "functions.h"
 #include "saveload.h"
 #include "string.h"
 #include "table/strings.h"