diff --git a/lib/fluent/plugin/output.rb b/lib/fluent/plugin/output.rb
index b2e5b1c94f..40f827cf7d 100644
--- a/lib/fluent/plugin/output.rb
+++ b/lib/fluent/plugin/output.rb
@@ -629,7 +629,7 @@ def get_worker_lock_if_need(name)
       def get_flush_thread_lock_if_need
         need_thread_lock = actual_flush_thread_count > 1
         if need_thread_lock
-          @flush_thread_mutex.synchronize { yeild }
+          @flush_thread_mutex.synchronize { yield }
         else
           yield
         end