diff --git a/.gitignore b/.gitignore
index 4e4de6d..4d94290 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,7 +3,6 @@
 .rubocop-https--*
 
 /.rspec_status
-/Gemfile.devel
 /Gemfile.lock
 /coverage/
 /test.doc
diff --git a/Gemfile.devel b/Gemfile.devel
new file mode 100644
index 0000000..69d8cb9
--- /dev/null
+++ b/Gemfile.devel
@@ -0,0 +1 @@
+gem "isodoc", git: "https://github.com/metanorma/isodoc", branch: "main"
diff --git a/lib/isodoc/m3aawg/presentation_xml_convert.rb b/lib/isodoc/m3aawg/presentation_xml_convert.rb
index 54de7e2..0c82365 100644
--- a/lib/isodoc/m3aawg/presentation_xml_convert.rb
+++ b/lib/isodoc/m3aawg/presentation_xml_convert.rb
@@ -12,7 +12,7 @@ def configuration
       def annex1(elem)
         lbl = @xrefs.anchor(elem["id"], :label)
         if t = elem.at(ns("./title"))
-          t.children = "<strong>#{t.children.to_xml}</strong>"
+          t.children = "<strong>#{to_xml(t.children)}</strong>"
         end
         prefix_name(elem, "<br/>", lbl, "title")
       end