diff --git a/tempest/services/compute/json/volumes_extensions_client.py b/tempest/services/compute/json/volumes_extensions_client.py
index 309dc5b..6b27f4a 100644
--- a/tempest/services/compute/json/volumes_extensions_client.py
+++ b/tempest/services/compute/json/volumes_extensions_client.py
@@ -73,10 +73,9 @@
         metadata: A dictionary of values to be used as metadata.
         """
         post_body = {
-            'size': size,
-            'display_name': kwargs.get('display_name'),
-            'metadata': kwargs.get('metadata'),
+            'size': size
         }
+        post_body.update(kwargs)
 
         post_body = json.dumps({'volume': post_body})
         resp, body = self.post('os-volumes', post_body)