diff --git a/hw/mips/gt64xxx_pci.c b/hw/mips/gt64xxx_pci.c
index 5843417567..3da2e67098 100644
--- a/hw/mips/gt64xxx_pci.c
+++ b/hw/mips/gt64xxx_pci.c
@@ -304,7 +304,8 @@ static void gt64120_pci_mapping(GT64120State *s)
       s->PCI0IO_length = ((s->regs[GT_PCI0IOHD] + 1) - (s->regs[GT_PCI0IOLD] & 0x7f)) << 21;
       isa_mem_base = s->PCI0IO_start;
       if (s->PCI0IO_length) {
-          isa_mmio_setup(&s->PCI0IO_mem, s->PCI0IO_length);
+          memory_region_init_alias(&s->PCI0IO_mem, OBJECT(s), "isa_mmio",
+                                   get_system_io(), 0, s->PCI0IO_length);
           memory_region_add_subregion(get_system_memory(), s->PCI0IO_start,
                                       &s->PCI0IO_mem);
       }