diff --git a/roles/backup/templates/s3backup.sh b/roles/backup/templates/s3backup.sh
index 42b8fc6..028a144 100644
--- a/roles/backup/templates/s3backup.sh
+++ b/roles/backup/templates/s3backup.sh
@@ -38,7 +38,7 @@ export AWS_SECRET_ACCESS_KEY="{{ backup_s3_aws_secret_access_key }}"
 
 # Tar up all items in the backup list, recursively, and pipe them straight
 # up to S3
-if [ -z "${DIRS[@]}" ]; then
+if [ -z "${DIRS[*]}" ]; then
 	echo "No directories configured to back up!"
 	exit 0
 fi