diff --git a/src/plugins/plugin_xep_0249.py b/src/plugins/plugin_xep_0249.py
index d0d59e95..de931d0d 100755
--- a/src/plugins/plugin_xep_0249.py
+++ b/src/plugins/plugin_xep_0249.py
@@ -104,7 +104,7 @@ class XEP_0249(object):
             return
         message = domish.Element((None, 'message'))
         message["to"] = target.full()
-        x_elt = message.addElement('x', NS_DIRECT_MUC_INVITATION)
+        x_elt = message.addElement((NS_DIRECT_MUC_INVITATION, 'x'))
         x_elt['jid'] = room.userhost()
         for opt in options:
             x_elt[opt] = options[opt]