1 files changed, 3 insertions, 1 deletions
diff --git a/actionpack/lib/action_view/helpers/asset_tag_helpers/asset_include_tag.rb b/actionpack/lib/action_view/helpers/asset_tag_helpers/asset_include_tag.rb
index e52797042f..fc0cca28b9 100644
--- a/actionpack/lib/action_view/helpers/asset_tag_helpers/asset_include_tag.rb
+++ b/actionpack/lib/action_view/helpers/asset_tag_helpers/asset_include_tag.rb
@@ -11,7 +11,9 @@ module ActionView
         attr_reader :config, :asset_paths
 
         class_attribute :expansions
-        self.expansions = { }
+        def self.inherited(base)
+          base.expansions = { }
+        end
 
         def initialize(config, asset_paths)
           @config = config