diff --git a/watcher/applier/rpcapi.py b/watcher/applier/rpcapi.py
index fdfbacd10..6788dc6d8 100644
--- a/watcher/applier/rpcapi.py
+++ b/watcher/applier/rpcapi.py
@@ -36,7 +36,7 @@ class ApplierAPI(service.Service):
         if not utils.is_uuid_like(action_plan_uuid):
             raise exception.InvalidUuidOrName(name=action_plan_uuid)
 
-        return self.conductor_client.call(
+        self.conductor_client.cast(
             context, 'launch_action_plan', action_plan_uuid=action_plan_uuid)
 
 
diff --git a/watcher/decision_engine/rpcapi.py b/watcher/decision_engine/rpcapi.py
index 23deec603..f0e0e2a18 100644
--- a/watcher/decision_engine/rpcapi.py
+++ b/watcher/decision_engine/rpcapi.py
@@ -37,7 +37,7 @@ class DecisionEngineAPI(service.Service):
         if not utils.is_uuid_like(audit_uuid):
             raise exception.InvalidUuidOrName(name=audit_uuid)
 
-        return self.conductor_client.call(
+        self.conductor_client.cast(
             context, 'trigger_audit', audit_uuid=audit_uuid)
 
 
diff --git a/watcher/tests/applier/test_rpcapi.py b/watcher/tests/applier/test_rpcapi.py
index 306d85bad..80e221ca3 100644
--- a/watcher/tests/applier/test_rpcapi.py
+++ b/watcher/tests/applier/test_rpcapi.py
@@ -43,10 +43,10 @@ class TestApplierAPI(base.TestCase):
                 api_version=rpcapi.ApplierAPI().API_VERSION)
 
     def test_execute_audit_without_error(self):
-        with mock.patch.object(om.RPCClient, 'call') as mock_call:
+        with mock.patch.object(om.RPCClient, 'cast') as mock_cast:
             action_plan_uuid = utils.generate_uuid()
             self.api.launch_action_plan(self.context, action_plan_uuid)
-            mock_call.assert_called_once_with(
+            mock_cast.assert_called_once_with(
                 self.context,
                 'launch_action_plan',
                 action_plan_uuid=action_plan_uuid)
diff --git a/watcher/tests/decision_engine/test_rpcapi.py b/watcher/tests/decision_engine/test_rpcapi.py
index e168cba48..61b9c2f93 100644
--- a/watcher/tests/decision_engine/test_rpcapi.py
+++ b/watcher/tests/decision_engine/test_rpcapi.py
@@ -44,8 +44,8 @@ class TestDecisionEngineAPI(base.TestCase):
                           audit_uuid)
 
     def test_execute_audit_without_error(self):
-        with mock.patch.object(om.RPCClient, 'call') as mock_call:
+        with mock.patch.object(om.RPCClient, 'cast') as mock_cast:
             audit_uuid = utils.generate_uuid()
             self.api.trigger_audit(self.context, audit_uuid)
-            mock_call.assert_called_once_with(
+            mock_cast.assert_called_once_with(
                 self.context, 'trigger_audit', audit_uuid=audit_uuid)