diff --git a/arch/arm/mach-kirkwood/ts219-setup.c b/arch/arm/mach-kirkwood/ts219-setup.c
index ec1a64f263d224285b9478f04a3c79cf85e173b7..cb0f56dfd5bad143bc50e217b526043f6e83735b 100644
--- a/arch/arm/mach-kirkwood/ts219-setup.c
+++ b/arch/arm/mach-kirkwood/ts219-setup.c
@@ -152,6 +152,7 @@ static unsigned int qnap_ts219_mpp_config[] __initdata = {
 	MPP14_UART1_RXD,	/* PIC controller */
 	MPP15_GPIO,		/* USB Copy button */
 	MPP16_GPIO,		/* Reset button */
+	MPP36_GPIO,		/* RAM: 0: 256 MB, 1: 512 MB */
 	0
 };