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-rw-r--r--slixmpp/plugins/xep_0297/stanza.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/slixmpp/plugins/xep_0297/stanza.py b/slixmpp/plugins/xep_0297/stanza.py
index 233ad4f6..d211f83c 100644
--- a/slixmpp/plugins/xep_0297/stanza.py
+++ b/slixmpp/plugins/xep_0297/stanza.py
@@ -14,7 +14,7 @@ class Forwarded(ElementBase):
name = 'forwarded'
namespace = 'urn:xmpp:forward:0'
plugin_attrib = 'forwarded'
- interfaces = set(['stanza'])
+ interfaces = {'stanza'}
def get_stanza(self):
for stanza in self: