diff --git a/arch/mips/cobalt/pci.c b/arch/mips/cobalt/pci.c
index d91027f..cfce7af 100644
--- a/arch/mips/cobalt/pci.c
+++ b/arch/mips/cobalt/pci.c
@@ -35,6 +35,7 @@
 	.mem_resource	= &cobalt_mem_resource,
 	.io_resource	= &cobalt_io_resource,
 	.io_offset	= 0 - GT_DEF_PCI0_IO_BASE,
+	.io_map_base	= CKSEG1ADDR(GT_DEF_PCI0_IO_BASE),
 };
 
 static int __init cobalt_pci_init(void)