diff --git a/lib/fluent/plugin/in_monitor_agent.rb b/lib/fluent/plugin/in_monitor_agent.rb
index 25d95b3381..18278e6a87 100644
--- a/lib/fluent/plugin/in_monitor_agent.rb
+++ b/lib/fluent/plugin/in_monitor_agent.rb
@@ -220,7 +220,7 @@ def start
       @srv.mount('/api/plugins.json', JSONMonitorServlet, self)
       @srv.mount('/api/config', LTSVConfigMonitorServlet, self)
       @srv.mount('/api/config.json', JSONConfigMonitorServlet, self)
-      thread_create :servlet do
+      thread_create :in_monitor_agent_servlet do
         @srv.start
       end
       if @tag