1 files changed, 4 insertions, 5 deletions
diff --git a/slixmpp/stanza/atom.py b/slixmpp/stanza/atom.py
index ccded724..8dde00de 100644
--- a/slixmpp/stanza/atom.py
+++ b/slixmpp/stanza/atom.py
@@ -21,9 +21,8 @@ class AtomEntry(ElementBase):
     namespace = 'http://www.w3.org/2005/Atom'
     name = 'entry'
     plugin_attrib = 'entry'
-    interfaces = set(('title', 'summary', 'id', 'published', 'updated'))
-    sub_interfaces = set(('title', 'summary', 'id', 'published',
-                          'updated'))
+    interfaces = {'title', 'summary', 'id', 'published', 'updated'}
+    sub_interfaces = {'title', 'summary', 'id', 'published', 'updated'}
 
 class AtomAuthor(ElementBase):
 
@@ -37,7 +36,7 @@ class AtomAuthor(ElementBase):
 
     name = 'author'
     plugin_attrib = 'author'
-    interfaces = set(('name', 'uri'))
-    sub_interfaces = set(('name', 'uri'))
+    interfaces = {'name', 'uri'}
+    sub_interfaces = {'name', 'uri'}
 
 register_stanza_plugin(AtomEntry, AtomAuthor)