diff --git a/roles/backup/templates/s3backup.sh b/roles/backup/templates/s3backup.sh
index 8d1e6b4..b84c911 100644
--- a/roles/backup/templates/s3backup.sh
+++ b/roles/backup/templates/s3backup.sh
@@ -63,7 +63,7 @@ if [ -n "${DIRS[*]}" ]; then
 		--exclude "{{ item }}" \
 	{% endfor %}
 		"${DIRS[@]}" \
-		| aws s3 cp - \
+		| aws s3 cp --expected-size 274877906944 - \
 		"s3://{{ backup_s3_bucket }}/{{ inventory_hostname }}/$(date "+{{ backup_dateformat }}").tar.gz"
 fi