diff --git a/xep-0049.xml b/xep-0049.xml
index 1557413e..09fa5614 100644
--- a/xep-0049.xml
+++ b/xep-0049.xml
@@ -172,7 +172,7 @@ CLIENT:
 SERVER:
 <iq type="error" iq="1004">
   <query xmlns="jabber:iq:private"/>
-  <error code="400" type="modify">
+  <error code="406" type="modify">
     <not-acceptable
         xmlns='urn:ietf:params:xml:ns:xmpp-stanzas'/>
   </error>