diff --git a/hw/ppc/pnv_xscom.c b/hw/ppc/pnv_xscom.c
index cf892c9fe88b8fc5d3bfe0f0392adf91947ee045..805b1d0c874811095a4b662d238c368b9dc3e17e 100644
--- a/hw/ppc/pnv_xscom.c
+++ b/hw/ppc/pnv_xscom.c
@@ -223,14 +223,12 @@ const MemoryRegionOps pnv_xscom_ops = {
 
 void pnv_xscom_init(PnvChip *chip, uint64_t size, hwaddr addr)
 {
-    SysBusDevice *sbd = SYS_BUS_DEVICE(chip);
     char *name;
 
     name = g_strdup_printf("xscom-%x", chip->chip_id);
     memory_region_init_io(&chip->xscom_mmio, OBJECT(chip), &pnv_xscom_ops,
                           chip, name, size);
-    sysbus_init_mmio(sbd, &chip->xscom_mmio);
-    sysbus_mmio_map(sbd, 0, addr);
+    memory_region_add_subregion(get_system_memory(), addr, &chip->xscom_mmio);
 
     memory_region_init(&chip->xscom, OBJECT(chip), name, size);
     address_space_init(&chip->xscom_as, &chip->xscom, name);