diff --git a/Tests/t_cext.py b/Tests/t_cext.py
index a93265e..51c446a 100644
--- a/Tests/t_cext.py
+++ b/Tests/t_cext.py
@@ -161,7 +161,12 @@ def test_simple_anonymous_bind(self):
         self.assertEquals(ctrls, [])
 
         # see if we can get the rootdse while we're here
-        m = l.search_ext("", _ldap.SCOPE_BASE, '(objectClass=*)')
+        m = l.search_ext(
+            "",
+            _ldap.SCOPE_BASE,
+            '(objectClass=*)',
+            ['objectClass', 'namingContexts'],
+        )
         result, pmsg, msgid, ctrls = l.result4(m, _ldap.MSG_ALL, self.timeout)
         self.assertEquals(result, _ldap.RES_SEARCH_RESULT)
         self.assertEquals(pmsg[0][0], "") # rootDSE has no dn