diff --git a/buildroot-external/board/asus/tinker/uboot.config b/buildroot-external/board/asus/tinker/uboot.config
index 92d243f45..548f3eca1 100644
--- a/buildroot-external/board/asus/tinker/uboot.config
+++ b/buildroot-external/board/asus/tinker/uboot.config
@@ -3,3 +3,4 @@
 CONFIG_OF_LIBFDT_OVERLAY=y
 CONFIG_SPL_PAD_TO=0x3f8000
 CONFIG_SYS_MMCSD_RAW_MODE_U_BOOT_SECTOR=0x2000
+# CONFIG_ENV_IS_IN_MMC is not set