--- nono/vm/xpbus.h	2026/04/29 17:05:33	1.1.1.4
+++ nono/vm/xpbus.h	2026/04/29 17:05:50	1.1.1.5
@@ -13,6 +13,7 @@
 #include "mainbus.h"
 #include <array>
 
+class NopIODevice;
 class SubRAMDevice;
 class SubRAM2Device;
 class XPRAMDevice;