diff --git a/lib/serf/client.js b/lib/serf/client.js
index <HASH>..<HASH> 100644
--- a/lib/serf/client.js
+++ b/lib/serf/client.js
@@ -84,7 +84,7 @@ Client.prototype = {
 
         var name = member.Name;
         if (members.some(function(member) {
-              return member.Tags["have-unprocessed-messages-for-" + name] == "true";
+              return member.Tags["buffered-for-" + name] == "true";
             }))
           return false;
Follow to change of droonga-engine