diff --git a/test/test_utils.py b/test/test_utils.py
index c6b8011c..f17fc246 100644
--- a/test/test_utils.py
+++ b/test/test_utils.py
@@ -81,7 +81,7 @@ class TestSetupReadline(unittest.TestCase):
             if all(not x.startswith('from os import ' + s)
                    for s in ['_', 'O_', 'EX_', 'MFD_', 'SF_', 'ST_',
                              'CLD_', 'POSIX_SPAWN_', 'P_', 'RWF_',
-                             'SCHED_'])
+                             'CLONE_', 'SCHED_'])
         }
         # There are quite a few differences, because both Windows and Linux
         # (posix and nt) libraries are included.