diff --git a/configs/Sinovoip_BPI_M3_defconfig b/configs/Sinovoip_BPI_M3_defconfig
index 45eadcb..c53ade0 100644
--- a/configs/Sinovoip_BPI_M3_defconfig
+++ b/configs/Sinovoip_BPI_M3_defconfig
@@ -12,6 +12,7 @@ CONFIG_USB0_ID_DET="PH11"
 CONFIG_USB1_VBUS_PIN="PD24"
 CONFIG_AXP_GPIO=y
 CONFIG_SATAPWR="PD25"
+CONFIG_MMC_SUNXI_SLOT_EXTRA=2
 CONFIG_DEFAULT_DEVICE_TREE="sun8i-a83t-sinovoip-bpi-m3"
 # CONFIG_SYS_MALLOC_CLEAR_ON_INIT is not set
 CONFIG_CONSOLE_MUX=y