diff --git a/cloudkitty/storage/v2/elasticsearch/client.py b/cloudkitty/storage/v2/elasticsearch/client.py
index 7716f039..525f8655 100644
--- a/cloudkitty/storage/v2/elasticsearch/client.py
+++ b/cloudkitty/storage/v2/elasticsearch/client.py
@@ -366,6 +366,8 @@ class ElasticsearchClient(object):
         if not paginate:
             offset = 0
 
+        metric_types = [metric_types] if metric_types else None
+
         must = self._build_must(begin, end, metric_types, filters)
         should = self._build_should(filters)
         composite = self._build_composite(groupby) if groupby else None
diff --git a/cloudkitty/storage/v2/opensearch/client.py b/cloudkitty/storage/v2/opensearch/client.py
index d5757c9b..6242019f 100644
--- a/cloudkitty/storage/v2/opensearch/client.py
+++ b/cloudkitty/storage/v2/opensearch/client.py
@@ -363,6 +363,8 @@ class OpenSearchClient(object):
         if not paginate:
             offset = 0
 
+        metric_types = [metric_types] if metric_types else None
+
         must = self._build_must(begin, end, metric_types, filters)
         should = self._build_should(filters)
         composite = self._build_composite(groupby) if groupby else None
diff --git a/releasenotes/notes/fix-v1-summary-and-total-with-es-os-backend-9540741b80819672.yaml b/releasenotes/notes/fix-v1-summary-and-total-with-es-os-backend-9540741b80819672.yaml
new file mode 100644
index 00000000..24623b82
--- /dev/null
+++ b/releasenotes/notes/fix-v1-summary-and-total-with-es-os-backend-9540741b80819672.yaml
@@ -0,0 +1,7 @@
+---
+fixes:
+  - |
+    Fixed a bug where ``openstack rating summary get -s <service>`` and
+    ``openstack rating total get -s <service>`` would fail when using the
+    Elasticsearch or OpenSearch storage backends. See story 2011128
+    <https://storyboard.openstack.org/#!/story/2011128>`_ for more details.