diff --git a/hw/ppc_newworld.c b/hw/ppc_newworld.c
index fabcc08..cd30f42 100644
--- a/hw/ppc_newworld.c
+++ b/hw/ppc_newworld.c
@@ -274,6 +274,7 @@ static void ppc_core99_init(QEMUMachineInitArgs *args)
     }
 
     /* Register 8 MB of ISA IO space */
+    isa_bus_new(NULL, get_system_io());
     isa_mmio_init(0xf2000000, 0x00800000);
 
     /* UniN init */