1 files changed, 5 insertions, 5 deletions
diff --git a/slixmpp/plugins/xep_0050/stanza.py b/slixmpp/plugins/xep_0050/stanza.py
index 107135f4..ef3eac9f 100644
--- a/slixmpp/plugins/xep_0050/stanza.py
+++ b/slixmpp/plugins/xep_0050/stanza.py
@@ -72,11 +72,11 @@ class Command(ElementBase):
     name = 'command'
     namespace = 'http://jabber.org/protocol/commands'
     plugin_attrib = 'command'
-    interfaces = set(('action', 'sessionid', 'node',
-                      'status', 'actions', 'notes'))
-    actions = set(('cancel', 'complete', 'execute', 'next', 'prev'))
-    statuses = set(('canceled', 'completed', 'executing'))
-    next_actions = set(('prev', 'next', 'complete'))
+    interfaces = {'action', 'sessionid', 'node',
+                  'status', 'actions', 'notes'}
+    actions = {'cancel', 'complete', 'execute', 'next', 'prev'}
+    statuses = {'canceled', 'completed', 'executing'}
+    next_actions = {'prev', 'next', 'complete'}
 
     def get_action(self):
         """