diff --git a/lib/rubocop/cops_documentation_generator.rb b/lib/rubocop/cops_documentation_generator.rb
index fb4c03921d25..81ecda6233c8 100644
--- a/lib/rubocop/cops_documentation_generator.rb
+++ b/lib/rubocop/cops_documentation_generator.rb
@@ -306,7 +306,7 @@ def table_of_content_for_department(department)
     filename = "#{department_to_basename(department)}.adoc"
     content = +"=== Department xref:#{filename}[#{type_title}]\n\n"
     cops_of_department(department).each do |cop|
-      anchor = cop.cop_name.sub('/', '').downcase
+      anchor = cop.cop_name.delete('/').downcase
       content << "* xref:#{filename}##{anchor}[#{cop.cop_name}]\n"
     end