diff --git a/slixmpp/features/feature_starttls/stanza.py b/slixmpp/features/feature_starttls/stanza.py
index 5552cf61..2f971723 100644
--- a/slixmpp/features/feature_starttls/stanza.py
+++ b/slixmpp/features/feature_starttls/stanza.py
@@ -6,7 +6,7 @@
 from slixmpp.xmlstream import StanzaBase, ElementBase
 
 
-class STARTTLS(ElementBase):
+class STARTTLS(StanzaBase):
 
     """
     """