diff --git a/arch/arm/mach-s3c6410/mach-smdk6410.c b/arch/arm/mach-s3c6410/mach-smdk6410.c
index 35d42e8cab92..9213a8ba283b 100644
--- a/arch/arm/mach-s3c6410/mach-smdk6410.c
+++ b/arch/arm/mach-s3c6410/mach-smdk6410.c
@@ -64,8 +64,6 @@ struct map_desc smdk6410_iodesc[] = {};
 static struct platform_device *smdk6410_devices[] __initdata = {
 };
 
-extern void s3c64xx_init_io(struct map_desc *, int);
-
 static void __init smdk6410_map_io(void)
 {
 	s3c64xx_init_io(smdk6410_iodesc, ARRAY_SIZE(smdk6410_iodesc));
diff --git a/arch/arm/plat-s3c/include/plat/cpu.h b/arch/arm/plat-s3c/include/plat/cpu.h
index 6d89a4637f30..e62ae0fcfe56 100644
--- a/arch/arm/plat-s3c/include/plat/cpu.h
+++ b/arch/arm/plat-s3c/include/plat/cpu.h
@@ -47,6 +47,7 @@ extern void s3c24xx_init_irq(void);
 extern void s3c64xx_init_irq(u32 vic0, u32 vic1);
 
 extern void s3c24xx_init_io(struct map_desc *mach_desc, int size);
+extern void s3c64xx_init_io(struct map_desc *mach_desc, int size);
 
 extern void s3c24xx_init_uarts(struct s3c2410_uartcfg *cfg, int no);