diff --git a/tests/unit/transport/test_tty.py b/tests/unit/transport/test_tty.py
index 87f1c2b51..520556e55 100644
--- a/tests/unit/transport/test_tty.py
+++ b/tests/unit/transport/test_tty.py
@@ -29,6 +29,7 @@ def test_login_bad_password_ConnectAuthError(self):
         self.terminal.read_prompt = MagicMock()
         self.terminal.read_prompt.return_value = (None, "badpasswd")
         self.terminal.write = MagicMock()
+        self.terminal._tty_close = MagicMock()
         self.assertRaises(EzErrors.ConnectAuthError, self.terminal._login_state_machine)
 
     @patch("jnpr.junos.transport.tty.sleep")