diff --git a/configs/Cubietruck_plus_defconfig b/configs/Cubietruck_plus_defconfig
index 34444ec0bd..3d999192cb 100644
--- a/configs/Cubietruck_plus_defconfig
+++ b/configs/Cubietruck_plus_defconfig
@@ -4,6 +4,7 @@ CONFIG_MACH_SUN8I_A83T=y
 CONFIG_DRAM_CLK=672
 CONFIG_DRAM_ZQ=15355
 CONFIG_DRAM_ODT_EN=y
+CONFIG_MMC_SUNXI_SLOT_EXTRA=2
 CONFIG_USB0_VBUS_PIN="AXP0-VBUS-ENABLE"
 CONFIG_USB0_VBUS_DET="AXP0-VBUS-DETECT"
 CONFIG_USB0_ID_DET="PH11"