diff --git a/arch/mips/include/asm/mach-ralink/spaces.h b/arch/mips/include/asm/mach-ralink/spaces.h
index 31a3525213cf..87d085c9ad61 100644
--- a/arch/mips/include/asm/mach-ralink/spaces.h
+++ b/arch/mips/include/asm/mach-ralink/spaces.h
@@ -2,7 +2,9 @@
 #ifndef __ASM_MACH_RALINK_SPACES_H_
 #define __ASM_MACH_RALINK_SPACES_H_
 
-#define IO_SPACE_LIMIT	0x1fffffff
+#define PCI_IOBASE	_AC(0xa0000000, UL)
+#define PCI_IOSIZE	SZ_16M
+#define IO_SPACE_LIMIT	(PCI_IOSIZE - 1)
 
 #include <asm/mach-generic/spaces.h>
 #endif