diff --git a/scripts/backup-code-s3.sh b/scripts/backup-code-s3.sh
index d7e2f59..4748cc0 100644
--- a/scripts/backup-code-s3.sh
+++ b/scripts/backup-code-s3.sh
@@ -56,7 +56,7 @@ mc ls "beget/${S3_BUCKET}/${S3_PREFIX}/code/" 2>/dev/null \
   | awk '{print $NF}' \
   | while read -r fname; do
       file_date=$(echo "$fname" | grep -oP '\d{4}-\d{2}-\d{2}' || echo "")
-      if [ -n "$file_date" ] && [ "$file_date" < "$CUTOFF" ]; then
+      if [ -n "$file_date" ] && [[ "$file_date" < "$CUTOFF" ]]; then
         mc rm "beget/${S3_BUCKET}/${S3_PREFIX}/code/${fname}" --quiet 2>/dev/null
         echo "[$(date)] Deleted old backup: ${fname}"
       fi