diff --git a/hw/ppc/spapr_pci.c b/hw/ppc/spapr_pci.c
index d258bc08d5..d7880f257a 100644
--- a/hw/ppc/spapr_pci.c
+++ b/hw/ppc/spapr_pci.c
@@ -1703,7 +1703,7 @@ static void spapr_phb_realize(DeviceState *dev, Error **errp)
     }
 #endif
 
-    memory_region_init_io(&sphb->msiwindow, NULL, &spapr_msi_ops, spapr,
+    memory_region_init_io(&sphb->msiwindow, OBJECT(sphb), &spapr_msi_ops, spapr,
                           "msi", msi_window_size);
     memory_region_add_subregion(&sphb->iommu_root, SPAPR_PCI_MSI_WINDOW,
                                 &sphb->msiwindow);