diff --git a/ceilometer/alarm/evaluator/combination.py b/ceilometer/alarm/evaluator/combination.py
index 5ee3c52c2b..82948eb24e 100644
--- a/ceilometer/alarm/evaluator/combination.py
+++ b/ceilometer/alarm/evaluator/combination.py
@@ -31,7 +31,7 @@ class CombinationEvaluator(evaluator.Evaluator):
 
     def _get_alarm_state(self, alarm_id):
         try:
-            alarm = self._client.alarm.get(alarm_id)
+            alarm = self._client.alarms.get(alarm_id)
         except Exception:
             LOG.exception(_('alarm retrieval failed'))
             return None
diff --git a/tests/alarm/evaluator/test_combination.py b/tests/alarm/evaluator/test_combination.py
index eeb7d7342e..633266a9a6 100644
--- a/tests/alarm/evaluator/test_combination.py
+++ b/tests/alarm/evaluator/test_combination.py
@@ -103,7 +103,7 @@ def test_retry_transient_api_failure(self):
         with mock.patch('ceilometerclient.client.get_client',
                         return_value=self.api_client):
             broken = exc.CommunicationError(message='broken')
-            self.api_client.alarm.get.side_effect = [
+            self.api_client.alarms.get.side_effect = [
                 broken,
                 broken,
                 broken,
@@ -123,7 +123,7 @@ def test_simple_insufficient(self):
         with mock.patch('ceilometerclient.client.get_client',
                         return_value=self.api_client):
             broken = exc.CommunicationError(message='broken')
-            self.api_client.alarm.get.side_effect = broken
+            self.api_client.alarms.get.side_effect = broken
             self._evaluate_all_alarms()
             self._assert_all_alarms('insufficient data')
             expected = [mock.call(alarm.alarm_id, state='insufficient data')
@@ -141,7 +141,7 @@ def test_to_ok_with_all_ok(self):
         self._set_all_alarms('insufficient data')
         with mock.patch('ceilometerclient.client.get_client',
                         return_value=self.api_client):
-            self.api_client.alarm.get.side_effect = [
+            self.api_client.alarms.get.side_effect = [
                 self._get_alarm('ok'),
                 self._get_alarm('ok'),
                 self._get_alarm('ok'),
@@ -161,7 +161,7 @@ def test_to_ok_with_one_alarm(self):
         self._set_all_alarms('alarm')
         with mock.patch('ceilometerclient.client.get_client',
                         return_value=self.api_client):
-            self.api_client.alarm.get.side_effect = [
+            self.api_client.alarms.get.side_effect = [
                 self._get_alarm('ok'),
                 self._get_alarm('ok'),
                 self._get_alarm('alarm'),
@@ -181,7 +181,7 @@ def test_to_alarm_with_all_alarm(self):
         self._set_all_alarms('ok')
         with mock.patch('ceilometerclient.client.get_client',
                         return_value=self.api_client):
-            self.api_client.alarm.get.side_effect = [
+            self.api_client.alarms.get.side_effect = [
                 self._get_alarm('alarm'),
                 self._get_alarm('alarm'),
                 self._get_alarm('alarm'),
@@ -201,7 +201,7 @@ def test_to_alarm_with_one_ok(self):
         self._set_all_alarms('ok')
         with mock.patch('ceilometerclient.client.get_client',
                         return_value=self.api_client):
-            self.api_client.alarm.get.side_effect = [
+            self.api_client.alarms.get.side_effect = [
                 self._get_alarm('ok'),
                 self._get_alarm('alarm'),
                 self._get_alarm('alarm'),
@@ -222,7 +222,7 @@ def test_to_unknown(self):
         with mock.patch('ceilometerclient.client.get_client',
                         return_value=self.api_client):
             broken = exc.CommunicationError(message='broken')
-            self.api_client.alarm.get.side_effect = [
+            self.api_client.alarms.get.side_effect = [
                 broken,
                 self._get_alarm('ok'),
                 self._get_alarm('insufficient data'),
@@ -249,7 +249,7 @@ def test_no_state_change(self):
         self._set_all_alarms('ok')
         with mock.patch('ceilometerclient.client.get_client',
                         return_value=self.api_client):
-            self.api_client.alarm.get.side_effect = [
+            self.api_client.alarms.get.side_effect = [
                 self._get_alarm('ok'),
                 self._get_alarm('ok'),
                 self._get_alarm('ok'),
@@ -266,7 +266,7 @@ def test_no_state_change_and_repeat_actions(self):
         self._set_all_alarms('ok')
         with mock.patch('ceilometerclient.client.get_client',
                         return_value=self.api_client):
-            self.api_client.alarm.get.side_effect = [
+            self.api_client.alarms.get.side_effect = [
                 self._get_alarm('ok'),
                 self._get_alarm('ok'),
                 self._get_alarm('ok'),