diff --git a/hw/ide.c b/hw/ide.c
index 34f1a98519..0e883b3b91 100644
--- a/hw/ide.c
+++ b/hw/ide.c
@@ -2141,7 +2141,7 @@ static void ide_ioport_write(void *opaque, uint32_t addr, uint32_t val)
             break;
         case WIN_DIAGNOSE:
             ide_set_signature(s);
-            s->status = 0x00; /* NOTE: READY is _not_ set */
+            s->status = READY_STAT;
             s->error = 0x01;
             ide_set_irq(s);
             break;