diff --git a/heat/engine/resources/openstack/aodh/gnocchi/alarm.py b/heat/engine/resources/openstack/aodh/gnocchi/alarm.py
index 9203a572ba..69353ac9f8 100644
--- a/heat/engine/resources/openstack/aodh/gnocchi/alarm.py
+++ b/heat/engine/resources/openstack/aodh/gnocchi/alarm.py
@@ -13,7 +13,6 @@
 
 
 from heat.common.i18n import _
-from heat.engine import constraints
 from heat.engine import properties
 from heat.engine.resources import alarm_base
 from heat.engine import support
@@ -27,7 +26,6 @@ COMMON_GNOCCHI_PROPERTIES = (
     'aggregation_method', 'threshold',
 )
 
-
 common_gnocchi_properties_schema = {
     COMPARISON_OPERATOR: properties.Schema(
         properties.Schema.STRING,
@@ -43,10 +41,6 @@ common_gnocchi_properties_schema = {
     AGGREGATION_METHOD: properties.Schema(
         properties.Schema.STRING,
         _('The aggregation method to compare to the threshold.'),
-        constraints=[
-            constraints.AllowedValues(['mean', 'sum', 'last', 'max', 'min',
-                                       'std', 'median', 'first', 'count']),
-        ],
         update_allowed=True
     ),
     GRANULARITY: properties.Schema(