diff --git a/selftests/all/unit/avocado/sysinfo_unittest.py b/selftests/all/unit/avocado/sysinfo_unittest.py
index 0d09f2c9babeea58dabfd9e6152489eadd655aff..4367a2947cccc0cc367703af2680751c42f4b995 100644
--- a/selftests/all/unit/avocado/sysinfo_unittest.py
+++ b/selftests/all/unit/avocado/sysinfo_unittest.py
@@ -91,8 +91,10 @@ class SysinfoTest(unittest.TestCase):
         job_postdir = os.path.join(testdir, 'post')
         self.assertTrue(os.path.isdir(job_postdir))
         # By default, there are no post test files
-        self.assertEqual(len(os.listdir(job_postdir)), 0,
-                         "Test post dir is not empty")
+        self.assertLess(len(os.listdir(job_postdir)), 2,
+                        "Post dir can contain 0-1 files depending on whether "
+                        "sys messages are obtainable or not:\n%s"
+                        % os.listdir(job_postdir))
 
     def tearDown(self):
         shutil.rmtree(self.tmpdir)