diff --git a/configs/Sinlinx_SinA33_defconfig b/configs/Sinlinx_SinA33_defconfig
index 2a5f985dd303df2627187522a0475b88fbfd974e..f4719db2d501afd1ca3b3f452ff6c9d148c0b73a 100644
--- a/configs/Sinlinx_SinA33_defconfig
+++ b/configs/Sinlinx_SinA33_defconfig
@@ -4,6 +4,7 @@ CONFIG_MACH_SUN8I_A33=y
 CONFIG_DRAM_CLK=552
 CONFIG_DRAM_ZQ=15291
 CONFIG_MMC0_CD_PIN="PB4"
+CONFIG_MMC_SUNXI_SLOT_EXTRA=2
 CONFIG_USB0_ID_DET="PH8"
 CONFIG_DEFAULT_DEVICE_TREE="sun8i-a33-sinlinx-sina33"
 # CONFIG_SYS_MALLOC_CLEAR_ON_INIT is not set