diff --git a/configs/a64-olinuxino_defconfig b/configs/a64-olinuxino_defconfig
index 63a0048702f33ca6365d40be6ff7f48dd3776bb1..02da3920671d2eff1e87fe68b3a7f367a9b1db0f 100644
--- a/configs/a64-olinuxino_defconfig
+++ b/configs/a64-olinuxino_defconfig
@@ -2,6 +2,7 @@ CONFIG_ARM=y
 CONFIG_ARCH_SUNXI=y
 CONFIG_MACH_SUN50I=y
 CONFIG_RESERVE_ALLWINNER_BOOT0_HEADER=y
+CONFIG_MMC_SUNXI_SLOT_EXTRA=2
 CONFIG_DEFAULT_DEVICE_TREE="sun50i-a64-olinuxino"
 # CONFIG_SYS_MALLOC_CLEAR_ON_INIT is not set
 CONFIG_SPL=y