diff --git a/lib/prettyprint.rb b/lib/prettyprint.rb
index 6f50192..85842eb 100644
--- a/lib/prettyprint.rb
+++ b/lib/prettyprint.rb
@@ -544,6 +544,11 @@ def group(indent=nil, open_obj='', close_obj='', open_width=nil, close_width=nil
       @first.pop
     end
 
+    # Yields to the block, for compatibility
+    def group_sub
+      yield
+    end
+
     # Method present for compatibility, but is a noop
     def flush # :nodoc:
     end