diff --git a/script/image.sh b/script/image.sh
index 404a0a0f..c055a26f 100755
--- a/script/image.sh
+++ b/script/image.sh
@@ -18,7 +18,7 @@ LOOP_DEV=$(sudo losetup --show -f "$BANAN_DISK_IMAGE_PATH")
 sudo partprobe $LOOP_DEV
 
 ROOT_PARTITION=${LOOP_DEV}p2
-MOUNT_DIR=/bananmnt
+MOUNT_DIR="${MOUNT_DIR:-/bananmnt}"
 
 sudo mkdir -p $MOUNT_DIR || { echo "Failed to create mount point dir."; exit 1; }