diff --git a/src/lxml/tests/test_threading.py b/src/lxml/tests/test_threading.py
index 8948c3e..5ede3f8 100644
--- a/src/lxml/tests/test_threading.py
+++ b/src/lxml/tests/test_threading.py
@@ -130,7 +130,7 @@ class ThreadingTestCase(HelperTestCase):
     <xsl:template match="tag" />
     <!-- extend time for parsing + transform -->
 ''' + '\n'.join('<xsl:template match="tag%x" />' % i for i in range(200)) + '''
-    <xsl:foo />
+    <xsl:UnExpectedElement />
 </xsl:stylesheet>''')
         self.assertRaises(etree.XSLTParseError,
                           etree.XSLT, style)
@@ -153,9 +153,10 @@ class ThreadingTestCase(HelperTestCase):
             self.assertTrue(len(log))
             if last_log is not None:
                 self.assertEqual(len(last_log), len(log))
-            self.assertEqual(4, len(log))
+            self.assertTrue(len(log) >= 2, len(log))
             for error in log:
-                self.assertTrue(':ERROR:XSLT:' in str(error))
+                self.assertTrue(':ERROR:XSLT:' in str(error), str(error))
+            self.assertTrue(any('UnExpectedElement' in str(error) for error in log), log)
             last_log = log
 
     def test_thread_xslt_apply_error_log(self):