diff --git a/arch/arm/mach-s3c/cpu.h b/arch/arm/mach-s3c/cpu.h
index d0adc9b40e25..a0187606b999 100644
--- a/arch/arm/mach-s3c/cpu.h
+++ b/arch/arm/mach-s3c/cpu.h
@@ -76,6 +76,6 @@ extern void s3c24xx_init_uartdevs(char *name,
 				  struct s3c24xx_uart_resources *res,
 				  struct s3c2410_uartcfg *cfg, int no);
 
-extern struct bus_type s3c6410_subsys;
+extern const struct bus_type s3c6410_subsys;
 
 #endif
diff --git a/arch/arm/mach-s3c/s3c6410.c b/arch/arm/mach-s3c/s3c6410.c
index e79f18d0ca81..a29276a4fde5 100644
--- a/arch/arm/mach-s3c/s3c6410.c
+++ b/arch/arm/mach-s3c/s3c6410.c
@@ -57,7 +57,7 @@ void __init s3c6410_init_irq(void)
 	s3c64xx_init_irq(~0 & ~(1 << 7), ~0);
 }
 
-struct bus_type s3c6410_subsys = {
+const struct bus_type s3c6410_subsys = {
 	.name		= "s3c6410-core",
 	.dev_name	= "s3c6410-core",
 };
diff --git a/arch/arm/mach-s3c/s3c64xx.c b/arch/arm/mach-s3c/s3c64xx.c
index 9f9717874d67..6c70ea7f2931 100644
--- a/arch/arm/mach-s3c/s3c64xx.c
+++ b/arch/arm/mach-s3c/s3c64xx.c
@@ -149,7 +149,7 @@ static struct map_desc s3c_iodesc[] __initdata = {
 	},
 };
 
-static struct bus_type s3c64xx_subsys = {
+static const struct bus_type s3c64xx_subsys = {
 	.name		= "s3c64xx-core",
 	.dev_name	= "s3c64xx-core",
 };