diff --git a/tempest/services/compute/json/servers_client.py b/tempest/services/compute/json/servers_client.py
index 990c986..851041b 100644
--- a/tempest/services/compute/json/servers_client.py
+++ b/tempest/services/compute/json/servers_client.py
@@ -236,8 +236,11 @@
         body = json.loads(body)
         return resp, body['metadata']
 
-    def set_server_metadata(self, server_id, meta):
-        post_body = json.dumps({'metadata': meta})
+    def set_server_metadata(self, server_id, meta, no_metadata_field=False):
+        if no_metadata_field:
+            post_body = ""
+        else:
+            post_body = json.dumps({'metadata': meta})
         resp, body = self.put('servers/%s/metadata' % str(server_id),
                               post_body, self.headers)
         body = json.loads(body)
diff --git a/tempest/services/compute/xml/servers_client.py b/tempest/services/compute/xml/servers_client.py
index bf72bdc..da993ab 100644
--- a/tempest/services/compute/xml/servers_client.py
+++ b/tempest/services/compute/xml/servers_client.py
@@ -482,14 +482,15 @@
         body = self._parse_key_value(etree.fromstring(body))
         return resp, body
 
-    def set_server_metadata(self, server_id, meta):
+    def set_server_metadata(self, server_id, meta, no_metadata_field=False):
         doc = Document()
-        metadata = Element("metadata")
-        doc.append(metadata)
-        for k, v in meta.items():
-            meta_element = Element("meta", key=k)
-            meta_element.append(Text(v))
-            metadata.append(meta_element)
+        if not no_metadata_field:
+            metadata = Element("metadata")
+            doc.append(metadata)
+            for k, v in meta.items():
+                meta_element = Element("meta", key=k)
+                meta_element.append(Text(v))
+                metadata.append(meta_element)
         resp, body = self.put('servers/%s/metadata' % str(server_id),
                               str(doc), self.headers)
         return resp, xml_to_json(etree.fromstring(body))