diff --git a/Lib/test/test_posix.py b/Lib/test/test_posix.py
index 073e069..b0a8cdf 100644
--- a/Lib/test/test_posix.py
+++ b/Lib/test/test_posix.py
@@ -271,7 +271,7 @@
             check_stat(uid, gid)
             self.assertRaises(OSError, chown_func, first_param, 0, -1)
             check_stat(uid, gid)
-            if gid != 0:
+            if 0 not in os.getgroups():
                 self.assertRaises(OSError, chown_func, first_param, -1, 0)
                 check_stat(uid, gid)
         # test illegal types