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-rw-r--r--slixmpp/plugins/xep_0004/stanza/field.py4
1 files changed, 2 insertions, 2 deletions
diff --git a/slixmpp/plugins/xep_0004/stanza/field.py b/slixmpp/plugins/xep_0004/stanza/field.py
index 42f1210b..2bcc823a 100644
--- a/slixmpp/plugins/xep_0004/stanza/field.py
+++ b/slixmpp/plugins/xep_0004/stanza/field.py
@@ -16,7 +16,7 @@ class FormField(ElementBase):
plugin_multi_attrib = 'fields'
interfaces = set(('answer', 'desc', 'required', 'value',
'label', 'type', 'var'))
- sub_interfaces = set(('desc',))
+ sub_interfaces = {'desc'}
plugin_tag_map = {}
plugin_attrib_map = {}
@@ -165,7 +165,7 @@ class FieldOption(ElementBase):
name = 'option'
plugin_attrib = 'option'
interfaces = set(('label', 'value'))
- sub_interfaces = set(('value',))
+ sub_interfaces = {'value'}
plugin_multi_attrib = 'options'