diff --git a/CHANGES.rst b/CHANGES.rst
index 2a7e17d..01c8bf4 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -4,7 +4,9 @@ Changelog
 2.2.4 (unreleased)
 ~~~~~~~~~~~~~~~~~~
 
-- Nothing changed yet.
+- Fix ``test_edit_with_errors`` to not import a private variable from 
+  ``zope.pagetemplate``. Fixes test failure with latest zope.pagetemplate.
+  [thet]
 
 
 2.2.3 (2015-07-18)
diff --git a/src/five/pt/tests/test_persistenttemplate.py b/src/five/pt/tests/test_persistenttemplate.py
index c49a51b..cf7f1a1 100644
--- a/src/five/pt/tests/test_persistenttemplate.py
+++ b/src/five/pt/tests/test_persistenttemplate.py
@@ -200,14 +200,15 @@ def test_filename_attribute(self):
         self.assertEqual(template().strip(), u'012')
 
     def test_edit_with_errors(self):
-        from zope.pagetemplate.pagetemplate import _error_start
         template = self._makeOne('foo', simple_error)
         # this should not raise:
         editable_text = get_editable_content(template)
         # and the errors should be in an xml comment at the start of
         # the editable text
         error_prefix = cgi.escape(
-            '%s\n %s\n-->\n' % (_error_start, '\n '.join(template._v_errors))
+            '<!-- Page Template Diagnostics\n {0}\n-->\n'.format(
+                '\n '.join(template._v_errors)
+            )
         )
         self.assertTrue(editable_text.startswith(error_prefix))