diff --git a/lib/simple_json/simple_json_renderable.rb b/lib/simple_json/simple_json_renderable.rb
index c583e63..91469b6 100644
--- a/lib/simple_json/simple_json_renderable.rb
+++ b/lib/simple_json/simple_json_renderable.rb
@@ -54,9 +54,7 @@ def rendered_format
     end
 
     def simple_renderer
-      @simple_renderer ||= SimpleJsonRenderer.new(self).tap do |r|
-        r.extend(_helpers) if respond_to?(:_helpers)
-      end
+      @simple_renderer ||= self.class.simple_json_renderer_class.new(self)
     end
 
     def render_json_template(template_name, **_options)
@@ -68,6 +66,14 @@ def render_json_template(template_name, **_options)
       if SimpleJson.template_cache_enabled? && !SimpleJsonRenderer.templates_loaded?
         SimpleJsonRenderer.load_all_templates!
       end
+
+      def self.simple_json_renderer_class
+        @simple_json_renderer_class ||= begin
+          klass = Class.new(SimpleJsonRenderer)
+          klass.include(_helpers) if method_defined?(:_helpers)
+          klass
+        end
+      end
     end
 
     def template_path
diff --git a/lib/simple_json/simple_json_renderer.rb b/lib/simple_json/simple_json_renderer.rb
index ba4e1a3..0cff63f 100644
--- a/lib/simple_json/simple_json_renderer.rb
+++ b/lib/simple_json/simple_json_renderer.rb
@@ -60,7 +60,7 @@ def initialize(controller)
     end
 
     def renderer(template_path)
-      renderers[template_path] || self.class.load_template(template_path).tap do |renderer|
+      renderers[template_path] || SimpleJson::SimpleJsonRenderer.load_template(template_path).tap do |renderer|
         renderers[template_path] = renderer
       end
     end