diff --git a/lib/logstash/filters/base.rb b/lib/logstash/filters/base.rb
index 23976fc28..4ce752a0e 100644
--- a/lib/logstash/filters/base.rb
+++ b/lib/logstash/filters/base.rb
@@ -117,8 +117,6 @@ class LogStash::Filters::Base < LogStash::Plugin
   # Optional.
   config :periodic_flush, :validate => :boolean, :default => false
 
-  RESERVED = ["type", "tags", "exclude_tags", "include_fields", "exclude_fields", "add_tag", "remove_tag", "add_field", "remove_field", "include_any", "exclude_any"]
-
   public
   def initialize(params)
     super