diff --git a/hw/nvram/ds1225y.c b/hw/nvram/ds1225y.c
index dbfd0d2e53..0945e36652 100644
--- a/hw/nvram/ds1225y.c
+++ b/hw/nvram/ds1225y.c
@@ -126,7 +126,7 @@ static void nvram_sysbus_realize(DeviceState *dev, Error **errp)
 
     s->contents = g_malloc0(s->chip_size);
 
-    memory_region_init_io(&s->iomem, OBJECT(s), &nvram_ops, s,
+    memory_region_init_io(&s->iomem, OBJECT(dev), &nvram_ops, s,
                           "nvram", s->chip_size);
     sysbus_init_mmio(SYS_BUS_DEVICE(dev), &s->iomem);