diff --git a/src/couchdb/couch_httpd_show.erl b/src/couchdb/couch_httpd_show.erl
index c098f5e..5c0699f 100644
--- a/src/couchdb/couch_httpd_show.erl
+++ b/src/couchdb/couch_httpd_show.erl
@@ -117,7 +117,7 @@ handle_doc_update_req(#httpd{
 handle_doc_update_req(#httpd{
         path_parts=[_, _, _, _, UpdateName]
     }=Req, Db, DDoc) ->
-    send_doc_update_response(Req, Db, DDoc, UpdateName, nil, null);
+    send_doc_update_response(Req, Db, DDoc, UpdateName, nil, couch_uuids:random());
 
 handle_doc_update_req(Req, _Db, _DDoc) ->
     send_error(Req, 404, <<"update_error">>, <<"Invalid path.">>).