diff --git a/arch/arm/mach-rpc/riscpc.c b/arch/arm/mach-rpc/riscpc.c
index 570cf937e73b..a454451c97c3 100644
--- a/arch/arm/mach-rpc/riscpc.c
+++ b/arch/arm/mach-rpc/riscpc.c
@@ -87,7 +87,7 @@ static void __init rpc_map_io(void)
 	/*
 	 * Turn off floppy.
 	 */
-	outb(0xc, 0x3f2);
+	writeb(0xc, PCIO_BASE + (0x3f2 << 2));
 
 	/*
 	 * RiscPC can't handle half-word loads and stores