diff --git a/sdata/step/3.install-files.sh b/sdata/step/3.install-files.sh
index f47239c7a..d213e75c6 100644
--- a/sdata/step/3.install-files.sh
+++ b/sdata/step/3.install-files.sh
@@ -32,6 +32,7 @@ function backup_clashing_targets(){
   done
 
   # Construct args_includes for rsync
+  local args_includes=()
   for i in "${clash_list[@]}"; do
     if [[ -d "$target_dir/$i" ]]; then
       args_includes+=(--include="/$i/")