diff --git a/tests/test_pem.py b/tests/test_pem.py
new file mode 100644
index 0000000..867f678
--- /dev/null
+++ b/tests/test_pem.py
@@ -0,0 +1,14 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+
+
+import unittest2
+from rsa._compat import b
+from rsa.pem import _markers
+
+
+class Test__markers(unittest2.TestCase):
+    def test_values(self):
+        self.assertEqual(_markers('RSA PRIVATE KEY'),
+            (b('-----BEGIN RSA PRIVATE KEY-----'),
+             b('-----END RSA PRIVATE KEY-----')))