diff --git a/aodh/api/controllers/v2/alarm_rules/gnocchi.py b/aodh/api/controllers/v2/alarm_rules/gnocchi.py
index 57fbed16..4008faf7 100644
--- a/aodh/api/controllers/v2/alarm_rules/gnocchi.py
+++ b/aodh/api/controllers/v2/alarm_rules/gnocchi.py
@@ -169,7 +169,8 @@ class AggregationMetricByResourcesLookupRule(AlarmGnocchiThresholdRule):
                 rule.metric),
             'headers': {'Content-Type': "application/json",
                         'X-Auth-Token': ks_client.auth_token},
-            'params': {'aggregation': rule.aggregation_method},
+            'params': {'aggregation': rule.aggregation_method,
+                       'percent_of_overlap': 0},
             'data': rule.query,
         }
 
diff --git a/aodh/tests/api/v2/test_alarm_scenarios.py b/aodh/tests/api/v2/test_alarm_scenarios.py
index 58b228eb..9117c42f 100644
--- a/aodh/tests/api/v2/test_alarm_scenarios.py
+++ b/aodh/tests/api/v2/test_alarm_scenarios.py
@@ -2929,7 +2929,8 @@ class TestAlarmsRuleGnocchi(TestAlarmsBase):
                          'resource/instance/metric/ameter'),
                     headers={'Content-Type': 'application/json',
                              'X-Auth-Token': mock.ANY},
-                    params={'aggregation': 'count'},
+                    params={'aggregation': 'count',
+                            'percent_of_overlap': 0},
                     data=expected_query)],
                     fake_post.mock_calls),