diff --git a/ceilometerclient/tests/v2/test_alarms.py b/ceilometerclient/tests/v2/test_alarms.py
index 28ae2f37..f01d3bd1 100644
--- a/ceilometerclient/tests/v2/test_alarms.py
+++ b/ceilometerclient/tests/v2/test_alarms.py
@@ -45,7 +45,6 @@ AN_ALARM = {u'alarm_actions': [u'http://site:8000/alarm'],
 CREATE_ALARM = copy.deepcopy(AN_ALARM)
 del CREATE_ALARM['timestamp']
 del CREATE_ALARM['state_timestamp']
-del CREATE_ALARM['matching_metadata']
 del CREATE_ALARM['alarm_id']
 DELTA_ALARM = {u'alarm_actions': ['url1', 'url2'],
                u'comparison_operator': u'lt',
diff --git a/ceilometerclient/v2/alarms.py b/ceilometerclient/v2/alarms.py
index 6a8529b1..41c17aa3 100644
--- a/ceilometerclient/v2/alarms.py
+++ b/ceilometerclient/v2/alarms.py
@@ -33,6 +33,7 @@ UPDATABLE_ATTRIBUTES = [
     'alarm_actions',
     'ok_actions',
     'insufficient_data_actions',
+    'matching_metadata',
     ]
 CREATION_ATTRIBUTES = UPDATABLE_ATTRIBUTES + ['name', 'project_id', 'user_id']