diff --git a/configs/Cubietruck_defconfig b/configs/Cubietruck_defconfig
index f93ff0d6c4..0c2fc8aafc 100644
--- a/configs/Cubietruck_defconfig
+++ b/configs/Cubietruck_defconfig
@@ -37,3 +37,4 @@ CONFIG_USB_GADGET_DOWNLOAD=y
 CONFIG_G_DNL_MANUFACTURER="Allwinner Technology"
 CONFIG_G_DNL_VENDOR_NUM=0x1f3a
 CONFIG_G_DNL_PRODUCT_NUM=0x1010
+CONFIG_MMC_SUNXI_SLOT_EXTRA=2
