diff --git a/prebuilt/common/bin/backuptool.sh b/prebuilt/common/bin/backuptool.sh
index c559f7c..24647bf 100755
--- a/prebuilt/common/bin/backuptool.sh
+++ b/prebuilt/common/bin/backuptool.sh
@@ -69,7 +69,7 @@
       if [ $v -ge 3 ]; then
         $script $stage
       else
-        ADDOND_VERSION=2 $script $stage
+        ADDOND_VERSION= $script $stage
       fi
     done
   done