diff --git a/logstash-core/lib/logstash/util/wrapped_acked_queue.rb b/logstash-core/lib/logstash/util/wrapped_acked_queue.rb
index 3f173344f..6effe9acd 100644
--- a/logstash-core/lib/logstash/util/wrapped_acked_queue.rb
+++ b/logstash-core/lib/logstash/util/wrapped_acked_queue.rb
@@ -250,14 +250,6 @@ module LogStash; module Util
       def filtered_size
         @originals.size + @generated.size
       end
-
-      def shutdown_signal_received?
-        false
-      end
-
-      def flush_signal_received?
-        false
-      end
     end
 
     class WriteClient