diff --git a/prebuilt/common/bin/backuptool.sh b/prebuilt/common/bin/backuptool.sh
index 34100ac..35199b9 100755
--- a/prebuilt/common/bin/backuptool.sh
+++ b/prebuilt/common/bin/backuptool.sh
@@ -66,7 +66,7 @@
       if [ $v -ge 3 ]; then
         $script $stage
       else
-        ADDOND_VERSION=2 $script $stage
+        ADDOND_VERSION= $script $stage
       fi
     done
   done