diff --git a/lib/capybara/util/save_and_open_page.rb b/lib/capybara/util/save_and_open_page.rb
index 29f4dfbf..e5d9c337 100644
--- a/lib/capybara/util/save_and_open_page.rb
+++ b/lib/capybara/util/save_and_open_page.rb
@@ -30,7 +30,7 @@ module Capybara
         list << name if File.directory?(name) and not name.to_s =~ /^\./
         list
       end
-      response_html.gsub(/("|')\/(#{directories.join('|')})/, '\1' + Capybara.asset_root.to_s + '/\2')
+      response_html.gsub(/=("|')\/(#{directories.join('|')})/, '=\1' + Capybara.asset_root.to_s + '/\2')
     end
   end
 end