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-rw-r--r--slixmpp/plugins/xep_0004/stanza/form.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/slixmpp/plugins/xep_0004/stanza/form.py b/slixmpp/plugins/xep_0004/stanza/form.py
index 32bfc0e3..52b18f81 100644
--- a/slixmpp/plugins/xep_0004/stanza/form.py
+++ b/slixmpp/plugins/xep_0004/stanza/form.py
@@ -24,7 +24,7 @@ class Form(ElementBase):
name = 'x'
plugin_attrib = 'form'
interfaces = OrderedSet(('instructions', 'reported', 'title', 'type', 'items', ))
- sub_interfaces = set(('title',))
+ sub_interfaces = {'title'}
form_types = set(('cancel', 'form', 'result', 'submit'))
def __init__(self, *args, **kwargs):