diff --git a/configs/Mele_M9_defconfig b/configs/Mele_M9_defconfig
index 445cc57..e5ab0ec 100644
--- a/configs/Mele_M9_defconfig
+++ b/configs/Mele_M9_defconfig
@@ -7,6 +7,8 @@
 +S:CONFIG_TARGET_MELE_M9=y
 +S:CONFIG_DRAM_CLK=312
 +S:CONFIG_DRAM_ZQ=120
+# The Mele M9 uses 3.3V for general IO
++S:CONFIG_AXP221_DCDC1_VOLT=3300
 # Ethernet phy power
 +S:CONFIG_AXP221_DLDO1_VOLT=3300
 # USB hub power