diff --git a/hw/ppc_prep.c b/hw/ppc_prep.c
index dec059a685..1cc0ae01f6 100644
--- a/hw/ppc_prep.c
+++ b/hw/ppc_prep.c
@@ -707,7 +707,7 @@ static void ppc_prep_init (ram_addr_t ram_size,
         usb_ohci_init_pci(pci_bus, -1);
     }
 
-    m48t59 = m48t59_init(i8259[8], 0, 0x0074, NVRAM_SIZE, 59);
+    m48t59 = m48t59_init_isa(isa_bus, 0x0074, NVRAM_SIZE, 59);
     if (m48t59 == NULL)
         return;
     sysctrl->nvram = m48t59;