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-rw-r--r--slixmpp/features/feature_mechanisms/stanza/failure.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/slixmpp/features/feature_mechanisms/stanza/failure.py b/slixmpp/features/feature_mechanisms/stanza/failure.py
index cc0ac877..29f0a343 100644
--- a/slixmpp/features/feature_mechanisms/stanza/failure.py
+++ b/slixmpp/features/feature_mechanisms/stanza/failure.py
@@ -18,7 +18,7 @@ class Failure(StanzaBase):
namespace = 'urn:ietf:params:xml:ns:xmpp-sasl'
interfaces = set(('condition', 'text'))
plugin_attrib = name
- sub_interfaces = set(('text',))
+ sub_interfaces = {'text'}
conditions = set(('aborted', 'account-disabled', 'credentials-expired',
'encryption-required', 'incorrect-encoding', 'invalid-authzid',
'invalid-mechanism', 'malformed-request', 'mechansism-too-weak',