diff --git a/configs/Mele_M9_defconfig b/configs/Mele_M9_defconfig
index 4708133..d8854f7 100644
--- a/configs/Mele_M9_defconfig
+++ b/configs/Mele_M9_defconfig
@@ -7,6 +7,7 @@
 CONFIG_DEFAULT_DEVICE_TREE="sun6i-a31-m9"
 CONFIG_SPL=y
 CONFIG_SYS_EXTRA_OPTIONS="USB_EHCI,SUNXI_GMAC"
+CONFIG_CMD_SETEXPR=y
 CONFIG_ETH_DESIGNWARE=y
 CONFIG_AXP221_DCDC1_VOLT=3300
 CONFIG_AXP221_DLDO1_VOLT=3300