diff --git a/openstackclient/tests/volume/v2/fakes.py b/openstackclient/tests/volume/v2/fakes.py
index 2e58e58df9..2fc5c8ff2e 100644
--- a/openstackclient/tests/volume/v2/fakes.py
+++ b/openstackclient/tests/volume/v2/fakes.py
@@ -256,9 +256,10 @@ class FakeVolume(object):
                 'key' + uuid.uuid4().hex: 'val' + uuid.uuid4().hex},
             'snapshot_id': random.randint(1, 5),
             'availability_zone': 'zone' + uuid.uuid4().hex,
-            'attachments': {
+            'attachments': [{
                 'device': '/dev/' + uuid.uuid4().hex,
-                'server_id': uuid.uuid4().hex},
+                'server_id': uuid.uuid4().hex,
+            }, ],
         }
 
         # Overwrite default attributes if there are some attributes set