diff --git a/configs/linkit-smart-7688_defconfig b/configs/linkit-smart-7688_defconfig
index fca86f9..1ecd4df 100644
--- a/configs/linkit-smart-7688_defconfig
+++ b/configs/linkit-smart-7688_defconfig
@@ -1,6 +1,9 @@
 CONFIG_MIPS=y
 CONFIG_SYS_TEXT_BASE=0x9c000000
+CONFIG_ENV_SIZE=0x4000
+CONFIG_ENV_OFFSET=0x80000
 CONFIG_NR_DRAM_BANKS=1
+CONFIG_ENV_SECT_SIZE=0x10000
 CONFIG_ARCH_MTMIPS=y
 CONFIG_BOARD_LINKIT_SMART_7688=y
 CONFIG_BOOT_ROM=y