diff --git a/slixmpp/xmlstream/stanzabase.py b/slixmpp/xmlstream/stanzabase.py
index 1c000b69..3e45f613 100644
--- a/slixmpp/xmlstream/stanzabase.py
+++ b/slixmpp/xmlstream/stanzabase.py
@@ -1374,14 +1374,6 @@ class StanzaBase(ElementBase):
     #: The default XMPP client namespace
     namespace = 'jabber:client'
 
-    #: There is a small set of attributes which apply to all XMPP stanzas:
-    #: the stanza type, the to and from JIDs, the stanza ID, and, especially
-    #: in the case of an Iq stanza, a payload.
-    interfaces = {'type', 'to', 'from', 'id', 'payload'}
-
-    #: A basic set of allowed values for the ``'type'`` interface.
-    types = {'get', 'set', 'error', None, 'unavailable', 'normal', 'chat'}
-
     def __init__(self, stream=None, xml=None, stype=None,
                  sto=None, sfrom=None, sid=None, parent=None):
         self.stream = stream
diff --git a/tests/test_stanza_base.py b/tests/test_stanza_base.py
index 35fa5e99..55554aa9 100644
--- a/tests/test_stanza_base.py
+++ b/tests/test_stanza_base.py
@@ -68,13 +68,5 @@ class TestStanzaBase(SlixTest):
         self.assertTrue(stanza['payload'] == [],
             "Stanza reply did not empty stanza payload.")
 
-    def testError(self):
-        """Test marking a stanza as an error."""
-        stanza = StanzaBase()
-        stanza['type'] = 'get'
-        stanza.error()
-        self.assertTrue(stanza['type'] == 'error',
-            "Stanza type is not 'error' after calling error()")
-
 
 suite = unittest.TestLoader().loadTestsFromTestCase(TestStanzaBase)