diff --git a/lib/haml/helpers/action_view_mods.rb b/lib/haml/helpers/action_view_mods.rb
index 0eb3e2b1..2ade335c 100644
--- a/lib/haml/helpers/action_view_mods.rb
+++ b/lib/haml/helpers/action_view_mods.rb
@@ -86,7 +86,7 @@ if defined?(ActionView) and not defined?(Merb::Plugins)
       else
         module CaptureHelper
           def capture_with_haml(*args, &block)
-            if is_haml?
+            if is_haml? && block_is_haml?(block)
               capture_haml(*args, &block)
             else
               capture_without_haml(*args, &block)