diff --git a/configs/bitmain_antminer_s9_defconfig b/configs/bitmain_antminer_s9_defconfig
index e7f473b..a3a7651 100644
--- a/configs/bitmain_antminer_s9_defconfig
+++ b/configs/bitmain_antminer_s9_defconfig
@@ -58,6 +58,7 @@
 CONFIG_NAND=y
 CONFIG_NAND_ZYNQ=y
 CONFIG_NAND_ZYNQ_USE_BOOTLOADER1_TIMINGS=y
+CONFIG_MII=y
 CONFIG_ZYNQ_GEM=y
 CONFIG_DEBUG_UART_ZYNQ=y
 CONFIG_DEBUG_UART_ANNOUNCE=y