diff --git a/lib/metanorma/standoc/converter.rb b/lib/metanorma/standoc/converter.rb
index a7f8ce94..74206b68 100644
--- a/lib/metanorma/standoc/converter.rb
+++ b/lib/metanorma/standoc/converter.rb
@@ -33,6 +33,7 @@ class Converter
         block Metanorma::Plugin::Lutaml::LutamlDiagramBlock
         block_macro Metanorma::Plugin::Lutaml::LutamlGmlDictionaryBlockMacro
         block Metanorma::Plugin::Lutaml::LutamlGmlDictionaryBlock
+        block_macro Metanorma::Plugin::Lutaml::LutamlKlassTableBlockMacro
         preprocessor Metanorma::Standoc::EmbedIncludeProcessor
         preprocessor Metanorma::Standoc::LinkProtectPreprocessor
         preprocessor Metanorma::Standoc::Datamodel::AttributesTablePreprocessor