diff --git a/misc.c b/misc.c
--- a/misc.c
+++ b/misc.c
@@ -2,6 +2,7 @@
 
 #include "stdafx.h"
 #include "openttd.h"
+#include "currency.h"
 #include "functions.h"
 #include "player.h"
 #include "string.h"