diff --git a/buildroot-external/board/asus/tinker/uboot.config b/buildroot-external/board/asus/tinker/uboot.config
index 13e696205..b5007a7e7 100644
--- a/buildroot-external/board/asus/tinker/uboot.config
+++ b/buildroot-external/board/asus/tinker/uboot.config
@@ -1,3 +1,4 @@
 # CONFIG_USB_STORAGE is not set
 # CONFIG_DOS_PARTITION is not set
 CONFIG_OF_LIBFDT_OVERLAY=y
+# CONFIG_ENV_IS_IN_MMC is not set