diff --git a/sat/plugins/plugin_sec_otr.py b/sat/plugins/plugin_sec_otr.py
index 409aa829..54b1866a 100644
--- a/sat/plugins/plugin_sec_otr.py
+++ b/sat/plugins/plugin_sec_otr.py
@@ -49,7 +49,7 @@ PLUGIN_INFO = {
     C.PI_DESCRIPTION: _(u"""Implementation of OTR"""),
 }
 
-NS_OTR = "otr_plugin"
+NS_OTR = "urn:xmpp:otr:0"
 PRIVATE_KEY = "PRIVATE KEY"
 OTR_MENU = D_(u"OTR")
 AUTH_TXT = D_(