diff --git a/templates/addons/etcd-backup-restore/etcd-backup-restore.yaml b/templates/addons/etcd-backup-restore/etcd-backup-restore.yaml
index 5b1aef688..f8f3425a4 100644
--- a/templates/addons/etcd-backup-restore/etcd-backup-restore.yaml
+++ b/templates/addons/etcd-backup-restore/etcd-backup-restore.yaml
@@ -35,7 +35,8 @@ data:
                 "secretAccessKey": "$${AWS_SECRET_ACCESS_KEY}",
                 "region": "$${AWS_REGION}",
                 "endpoint": "$${AWS_ENDPOINT#*$$BUCKET_NAME.}",
-                "sseCustomerKey": "$${AWS_SSE_CUSTOMER_KEY}"
+                "sseCustomerKey": "$${AWS_SSE_CUSTOMER_KEY}",
+                "sseCustomerAlgorithm": "AES256"
               }
               EOF
             volumeMounts: