diff --git a/configs/A20-Olimex-SOM-EVB_defconfig b/configs/A20-Olimex-SOM-EVB_defconfig
index f616388..001d31b 100644
--- a/configs/A20-Olimex-SOM-EVB_defconfig
+++ b/configs/A20-Olimex-SOM-EVB_defconfig
@@ -3,6 +3,9 @@ CONFIG_ARCH_SUNXI=y
 CONFIG_MACH_SUN7I=y
 CONFIG_DRAM_CLK=480
 CONFIG_MMC0_CD_PIN="PH1"
+CONFIG_MMC3_CD_PIN="PH0"
+CONFIG_MMC3_PINS="PH"
+CONFIG_MMC_SUNXI_SLOT_EXTRA=3
 CONFIG_USB0_VBUS_PIN="PB9"
 CONFIG_USB0_VBUS_DET="PH5"
 CONFIG_DEFAULT_DEVICE_TREE="sun7i-a20-olimex-som-evb"