diff --git a/actionview/lib/action_view/helpers/asset_tag_helper.rb b/actionview/lib/action_view/helpers/asset_tag_helper.rb
index 91e934cd646a8c4b48e005ad83a4d77a0802bc47..cc54faa778793aa5ae4207d4964f85937e07a5eb 100644
--- a/actionview/lib/action_view/helpers/asset_tag_helper.rb
+++ b/actionview/lib/action_view/helpers/asset_tag_helper.rb
@@ -136,7 +136,7 @@ def auto_discovery_link_tag(type = :rss, url_options = {}, tag_options = {})
         tag(
           "link",
           "rel"   => tag_options[:rel] || "alternate",
-          "type"  => tag_options[:type] || Mime[type].to_s,
+          "type"  => tag_options[:type] || Template::Types[type].to_s,
           "title" => tag_options[:title] || type.to_s.upcase,
           "href"  => url_options.is_a?(Hash) ? url_for(url_options.merge(:only_path => false)) : url_options
         )
diff --git a/actionview/lib/action_view/lookup_context.rb b/actionview/lib/action_view/lookup_context.rb
index d3935788ef889627ac79870eceb65aee506f95b5..63a3c4ea5ed5092d2ced69542830397d0c0e7d85 100644
--- a/actionview/lib/action_view/lookup_context.rb
+++ b/actionview/lib/action_view/lookup_context.rb
@@ -67,7 +67,7 @@ class DetailsKey #:nodoc:
       def self.get(details)
         if details[:formats]
           details = details.dup
-          details[:formats] &= Mime::SET.symbols
+          details[:formats] &= Template::Types.symbols
         end
         @details_keys[details] ||= new
       end
diff --git a/actionview/lib/action_view/rendering.rb b/actionview/lib/action_view/rendering.rb
index 8604637da268155dfefcc28752e83742f1e1f602..3ca7f9d22050012dd5dce9bb13280b513e4a2230 100644
--- a/actionview/lib/action_view/rendering.rb
+++ b/actionview/lib/action_view/rendering.rb
@@ -84,7 +84,7 @@ def render_to_body(options = {})
     end
 
     def rendered_format
-      Mime[lookup_context.rendered_format]
+      Template::Types[lookup_context.rendered_format]
     end
 
     private
diff --git a/actionview/lib/action_view/template/types.rb b/actionview/lib/action_view/template/types.rb
index ddc5b258318c6e06becd84bb6165b20723645aef..c233d06ccb7ffadf2f01f49a79bb9351cac2e92c 100644
--- a/actionview/lib/action_view/template/types.rb
+++ b/actionview/lib/action_view/template/types.rb
@@ -48,7 +48,7 @@ def self.[](type)
         type_klass[type]
       end
 
-      def symbols
+      def self.symbols
         type_klass::SET.symbols
       end
     end