diff --git a/src/common/xmpp/auth_nb.py b/src/common/xmpp/auth_nb.py
index d0e615d1db3aca8b30e28548261cbdf17473b631..ff54b80e7abd730fab91c0c1bd48a25a64ca8330 100644
--- a/src/common/xmpp/auth_nb.py
+++ b/src/common/xmpp/auth_nb.py
@@ -463,8 +463,7 @@ class SASL(PlugIn):
                     '\r', '').replace('\n', '')
             node = Node('response', attrs={'xmlns':NS_SASL}, payload=[sasl_data])
         elif self.mechanism == 'PLAIN':
-            sasl_data = u'%s\x00%s\x00%s' % (self.username + '@' + \
-                    self._owner.Server, self.username, self.password)
+            sasl_data = u'\x00%s\x00%s' % (self.username, self.password)
             sasl_data = sasl_data.encode('utf-8').encode('base64').replace(
                     '\n', '')
             node = Node('auth', attrs={'xmlns': NS_SASL, 'mechanism': 'PLAIN'},