diff --git a/lib/critical_path_css/rails/config_loader.rb b/lib/critical_path_css/rails/config_loader.rb
index 5addd98..db042d7 100644
--- a/lib/critical_path_css/rails/config_loader.rb
+++ b/lib/critical_path_css/rails/config_loader.rb
@@ -9,7 +9,7 @@ def initialize
       end
 
       def config
-        @config ||= YAML.safe_load(ERB.new(File.read(configuration_file_path)).result, [], [], true)[::Rails.env]
+        @config ||= YAML.safe_load(ERB.new(File.read(configuration_file_path)).result, aliases: true)[::Rails.env]
       end
 
       private