diff --git a/lib/plugin/metadata.rb b/lib/plugin/metadata.rb
index 0d5aa308ba9..65686ede452 100644
--- a/lib/plugin/metadata.rb
+++ b/lib/plugin/metadata.rb
@@ -2,7 +2,7 @@
 module Plugin; end
 
 class Plugin::Metadata
-  FIELDS = [:name, :about, :version, :authors]
+  FIELDS ||= [:name, :about, :version, :authors]
   attr_accessor *FIELDS
 
   def self.parse(text)
diff --git a/lib/text_sentinel.rb b/lib/text_sentinel.rb
index b16e761329d..e7a6b3b3339 100644
--- a/lib/text_sentinel.rb
+++ b/lib/text_sentinel.rb
@@ -5,7 +5,7 @@ class TextSentinel
 
   attr_accessor :text
 
-  ENTROPY_SCALE = 0.7
+  ENTROPY_SCALE ||= 0.7
 
   def initialize(text, opts=nil)
     @opts = opts || {}