diff --git a/configs/sam3u-ek/src/sam3uek_internal.h b/configs/sam3u-ek/src/sam3uek_internal.h
index 0e816204bda..21f57adfb2e 100755
--- a/configs/sam3u-ek/src/sam3uek_internal.h
+++ b/configs/sam3u-ek/src/sam3uek_internal.h
@@ -65,6 +65,11 @@
 #define GPIO_BUTTON1 (GPIO_INPUT|GPIO_CFG_PULLUP|GPIO_CFG_DEGLITCH|GPIO_PORT_PIOA|GPIO_PIN18)
 #define GPIO_BUTTON2 (GPIO_INPUT|GPIO_CFG_PULLUP|GPIO_CFG_DEGLITCH|GPIO_PORT_PIOA|GPIO_PIN19)
 
+/* SD Card Detect */
+
+#define GPIO_MCI_CD  (GPIO_INPUT|GPIO_CFG_PULLUP|GPIO_PORT_PIOA|GPIO_PIN25)
+
+
 #define IRQ_BUTTON1  SAM3U_IRQ_PA18
 #define IRQ_BUTTON2  SAM3U_IRQ_PA19