diff --git a/include/hw/nubus/nubus.h b/include/hw/nubus/nubus.h
index b3b4d2eadb..fee79b71d1 100644
--- a/include/hw/nubus/nubus.h
+++ b/include/hw/nubus/nubus.h
@@ -51,7 +51,7 @@ struct NubusBus {
     qemu_irq irqs[NUBUS_IRQS];
 };
 
-#define NUBUS_DECL_ROM_MAX_SIZE    (128 * KiB)
+#define NUBUS_DECL_ROM_MAX_SIZE    (1 * MiB)
 
 struct NubusDevice {
     DeviceState qdev;