diff --git a/lib/css_parser.rb b/lib/css_parser.rb
index f62e180..0cbe40d 100644
--- a/lib/css_parser.rb
+++ b/lib/css_parser.rb
@@ -52,8 +52,6 @@ module CssParser
   # TODO: declaration_hashes should be able to contain a RuleSet
   #       this should be a Class method
   def self.merge(*rule_sets)
-    @folded_declaration_cache = {}
-
     # in case called like CssParser.merge([rule_set, rule_set])
     rule_sets.flatten! if rule_sets[0].is_a?(Array)
 
diff --git a/lib/css_parser/parser.rb b/lib/css_parser/parser.rb
index 57d3a5e..0dddb98 100644
--- a/lib/css_parser/parser.rb
+++ b/lib/css_parser/parser.rb
@@ -31,12 +31,6 @@ class Parser
     # Array of CSS files that have been loaded.
     attr_reader   :loaded_uris
 
-    #--
-    # Class variable? see http://www.oreillynet.com/ruby/blog/2007/01/nubygems_dont_use_class_variab_1.html
-    #++
-    @folded_declaration_cache = {}
-    class << self; attr_reader :folded_declaration_cache; end
-
     def initialize(options = {})
       @options = {
         absolute_paths: false,