diff --git a/murano/tests/unit/dsl/test_agent.py b/murano/tests/unit/dsl/test_agent.py
index a21f8e6a3..2e0b626b5 100644
--- a/murano/tests/unit/dsl/test_agent.py
+++ b/murano/tests/unit/dsl/test_agent.py
@@ -62,6 +62,7 @@ class TestAgentListener(test_case.DslTestCase):
 class TestAgent(test_case.DslTestCase):
     def test_agent_enabled(self):
         self.override_config('disable_murano_agent', False, 'engine')
+        self.override_config('signing_key', False, group='engine')
         agent_cls = 'murano.engine.system.agent.Agent'
         a = agent.Agent(mock.MagicMock())
         self.assertTrue(a.enabled)
@@ -73,6 +74,7 @@ class TestAgent(test_case.DslTestCase):
 
     def test_agent_disabled(self):
         self.override_config('disable_murano_agent', True, 'engine')
+        self.override_config('signing_key', False, group='engine')
         a = agent.Agent(mock.MagicMock())
         self.assertFalse(a.enabled)
         self.assertRaises(exc.PolicyViolationException, a.call, {}, None)
diff --git a/murano/tests/unit/engine/system/test_agent.py b/murano/tests/unit/engine/system/test_agent.py
index 57b9660dd..65e1029ae 100644
--- a/murano/tests/unit/engine/system/test_agent.py
+++ b/murano/tests/unit/engine/system/test_agent.py
@@ -42,6 +42,7 @@ class TestAgent(base.MuranoTestCase):
             self.yaml_loader = yamllib.SafeLoader
 
         self.override_config('disable_murano_agent', False, group='engine')
+        self.override_config('signing_key', False, group='engine')
 
         mock_host = mock.MagicMock()
         mock_host.id = '1234'
@@ -355,6 +356,8 @@ class TestExecutionPlan(base.MuranoTestCase):
         else:
             self.yaml_loader = yamllib.SafeLoader
 
+        self.override_config('signing_key', False, group='engine')
+
         self.mock_murano_class = mock.Mock(spec=murano_type.MuranoClass)
         self.mock_murano_class.name = 'io.murano.system.Agent'
         self.mock_murano_class.declared_parents = []