diff --git a/ironic_python_agent/agent.py b/ironic_python_agent/agent.py
index 0df622f8c..4ca6f7e4e 100644
--- a/ironic_python_agent/agent.py
+++ b/ironic_python_agent/agent.py
@@ -343,7 +343,7 @@ class IronicPythonAgent(base.ExecuteCommandMixin):
             try:
                 server.handle_request()
             except BaseException as e:
-                msg = "Failed due to unknow exception. Error %s" % e
+                msg = "Failed due to an unknown exception. Error %s" % e
                 LOG.exception(msg)
                 raise errors.IronicAPIError(msg)
         LOG.info('shutting down')
diff --git a/ironic_python_agent/tests/unit/test_agent.py b/ironic_python_agent/tests/unit/test_agent.py
index 137121708..3a9024c83 100644
--- a/ironic_python_agent/tests/unit/test_agent.py
+++ b/ironic_python_agent/tests/unit/test_agent.py
@@ -244,7 +244,7 @@ class TestBaseAgent(ironic_agent_base.IronicAgentTest):
         }
 
         self.assertRaisesRegex(errors.IronicAPIError,
-                               'Failed due to unknow exception.',
+                               'Failed due to an unknown exception.',
                                self.agent.run)
 
         self.assertTrue(mock_wait.called)