diff --git a/lib/fluent/plugin/out_roundrobin.rb b/lib/fluent/plugin/out_roundrobin.rb
index ceda1eaddc..d66af41c26 100644
--- a/lib/fluent/plugin/out_roundrobin.rb
+++ b/lib/fluent/plugin/out_roundrobin.rb
@@ -31,7 +31,6 @@ def initialize
     end
 
     attr_reader :weights
-    attr_accessor :rand_seed
 
     def configure(conf)
       super