diff --git a/lib/active_resource/schema.rb b/lib/active_resource/schema.rb
index 5c421b1d7c..40206c6441 100644
--- a/lib/active_resource/schema.rb
+++ b/lib/active_resource/schema.rb
@@ -47,6 +47,7 @@ def attribute(name, type, options = {})
       #   attr_names.each { |name| attribute(name, 'string', options) }
       # end
       class_eval <<-EOV, __FILE__, __LINE__ + 1
+        # frozen_string_literal: true
         def #{attr_type}(*args)
           options = args.extract_options!
           attr_names = args