diff --git a/lib/action_controller/caching/actions.rb b/lib/action_controller/caching/actions.rb
index 8c0ee84..e68c712 100644
--- a/lib/action_controller/caching/actions.rb
+++ b/lib/action_controller/caching/actions.rb
@@ -165,7 +165,7 @@ def around(controller)
             body = controller._save_fragment(cache_path.path, @store_options)
           end
 
-          body = render_to_string(controller, body) unless cache_layout
+          body = render_to_string(controller, body.respond_to?(:html_safe) ? body.html_safe : body) unless cache_layout
 
           controller.response_body = body
           controller.content_type = Mime[cache_path.extension || :html]