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-rw-r--r--slixmpp/features/feature_mechanisms/stanza/challenge.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/slixmpp/features/feature_mechanisms/stanza/challenge.py b/slixmpp/features/feature_mechanisms/stanza/challenge.py
index 21a061ee..7fa76e18 100644
--- a/slixmpp/features/feature_mechanisms/stanza/challenge.py
+++ b/slixmpp/features/feature_mechanisms/stanza/challenge.py
@@ -19,7 +19,7 @@ class Challenge(StanzaBase):
name = 'challenge'
namespace = 'urn:ietf:params:xml:ns:xmpp-sasl'
- interfaces = set(('value',))
+ interfaces = {'value'}
plugin_attrib = name
def setup(self, xml):