diff --git a/spritecache.c b/spritecache.c
--- a/spritecache.c
+++ b/spritecache.c
@@ -7,6 +7,7 @@
 #include "fileio.h"
 #include "newgrf.h"
 #include "md5.h"
+#include "variables.h"
 #include <ctype.h>
 
 #define SPRITECACHE_ID 0xF00F0006