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-rw-r--r--slixmpp/plugins/xep_0060/stanza/base.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/slixmpp/plugins/xep_0060/stanza/base.py b/slixmpp/plugins/xep_0060/stanza/base.py
index b8f3d6cc..2f781e98 100644
--- a/slixmpp/plugins/xep_0060/stanza/base.py
+++ b/slixmpp/plugins/xep_0060/stanza/base.py
@@ -11,7 +11,7 @@ from slixmpp.xmlstream import ET
class OptionalSetting(object):
- interfaces = set(('required',))
+ interfaces = {'required'}
def set_required(self, value):
if value in (True, 'true', 'True', '1'):