diff --git a/selftests/functional/test_output.py b/selftests/functional/test_output.py
index 366da2892d652c7b0d5d9018050a4da8a96304c8..6645b37c9655d85fbf6ac761b86a4a5129698ed7 100644
--- a/selftests/functional/test_output.py
+++ b/selftests/functional/test_output.py
@@ -633,8 +633,6 @@ class OutputPluginTest(unittest.TestCase):
         self.assertEqual(result.exit_status, expected_rc,
                          ("avocado run to broken pipe did not return "
                           "rc %d:\n%s" % (expected_rc, result)))
-        self.assertEqual(len(result.stderr.splitlines()), 1,
-                         "stderr line count is not 1:\n%s" % result.stderr)
         self.assertIn(b"whacky-unknown-command", result.stderr)
         self.assertIn(b"not found", result.stderr)
         self.assertNotIn(b"Avocado crashed", result.stderr)