diff --git a/arch/arm/mach-s5p64x0/include/mach/uncompress.h b/arch/arm/mach-s5p64x0/include/mach/uncompress.h
index bc04bd5..bbcc3f6 100644
--- a/arch/arm/mach-s5p64x0/include/mach/uncompress.h
+++ b/arch/arm/mach-s5p64x0/include/mach/uncompress.h
@@ -23,9 +23,9 @@
 	chipid = *(const volatile unsigned int __force *) 0xE0100118;
 
 	if ((chipid & 0xff000) == 0x50000)
-		uart_base = S5P6450_PA_UART(CONFIG_S3C_LOWLEVEL_UART_PORT);
+		uart_base = (volatile u8 *)S5P6450_PA_UART(CONFIG_S3C_LOWLEVEL_UART_PORT);
 	else
-		uart_base = S5P6440_PA_UART(CONFIG_S3C_LOWLEVEL_UART_PORT);
+		uart_base = (volatile u8 *)S5P6440_PA_UART(CONFIG_S3C_LOWLEVEL_UART_PORT);
 
 	fifo_mask = S3C2440_UFSTAT_TXMASK;
 	fifo_max = 63 << S3C2440_UFSTAT_TXSHIFT;