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-rw-r--r--slixmpp/stanza/roster.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/slixmpp/stanza/roster.py b/slixmpp/stanza/roster.py
index c017c33f..f846d595 100644
--- a/slixmpp/stanza/roster.py
+++ b/slixmpp/stanza/roster.py
@@ -36,7 +36,7 @@ class Roster(ElementBase):
namespace = 'jabber:iq:roster'
name = 'query'
plugin_attrib = 'roster'
- interfaces = set(('items', 'ver'))
+ interfaces = {'items', 'ver'}
def get_ver(self):
"""