diff --git a/lib/isodoc/ieee/xref.rb b/lib/isodoc/ieee/xref.rb
index 741d016..6d12d69 100644
--- a/lib/isodoc/ieee/xref.rb
+++ b/lib/isodoc/ieee/xref.rb
@@ -61,11 +61,11 @@ def middle_section_asset_names(doc)
         end
       end
 
-      def sequential_formula_names(clause)
+      def sequential_formula_names(clause, container: false)
         c = Counter.new
         clause.xpath(ns(".//formula")).noblank.each do |t|
           @anchors[t["id"]] = anchor_struct(
-            c.increment(t).print, nil,
+            c.increment(t).print, container ? t : nil,
             t["inequality"] ? @labels["inequality"] : @labels["formula"],
             "formula", t["unnumbered"]
           )
diff --git a/spec/isodoc/section_spec.rb b/spec/isodoc/section_spec.rb
index dbe1cf4..8677050 100644
--- a/spec/isodoc/section_spec.rb
+++ b/spec/isodoc/section_spec.rb
@@ -898,7 +898,7 @@
     OUTPUT
     html = <<~OUTPUT
       <div id='boilerplate-participants'>
-         <h1 class='IntroTitle'>Participants</h1>
+         <h1 class='IntroTitle' id="_">Participants</h1>
          <div id='boilerplate-participants-wg'>
            <p id='_'>
               At the time this draft Standard was completed, the Working Group had the
@@ -1136,8 +1136,8 @@
       .to be_equivalent_to xmlpp(presxml)
     IsoDoc::IEEE::HtmlConvert.new({}).convert("test", presxml, false)
     expect(File.exist?("test.html")).to be true
-    expect(xmlpp(Nokogiri::XML(File.read("test.html"))
-      .at("//div[@id = 'boilerplate-participants']").to_xml))
+    expect(strip_guid(xmlpp(Nokogiri::XML(File.read("test.html"))
+      .at("//div[@id = 'boilerplate-participants']").to_xml)))
       .to be_equivalent_to xmlpp(html)
     IsoDoc::IEEE::WordConvert.new({}).convert("test", presxml, false)
     expect(File.exist?("test.doc")).to be true