diff --git a/actionpack/lib/action_view/helpers/capture_helper.rb b/actionpack/lib/action_view/helpers/capture_helper.rb
index 17bbfe2efd..278139cadb 100644
--- a/actionpack/lib/action_view/helpers/capture_helper.rb
+++ b/actionpack/lib/action_view/helpers/capture_helper.rb
@@ -215,7 +215,7 @@ module ActionView
       def flush_output_buffer #:nodoc:
         if output_buffer && !output_buffer.empty?
           response.body_parts << output_buffer
-          self.output_buffer = output_buffer[0,0]
+          self.output_buffer = output_buffer.respond_to?(:clone_empty) ? output_buffer.clone_empty : output_buffer[0, 0]
           nil
         end
       end