diff --git a/config.rb b/config.rb
index 652c6f4d1..0460299ca 100644
--- a/config.rb
+++ b/config.rb
@@ -41,6 +41,7 @@
 activate :directory_indexes
 
 page "documentation/**/*.html", directory_index: false
+config[:ignored_sitemap_matchers][:partials] = proc { |file| file =~ %r{/_[^_]} && file !~ %r{\A/source/documentation/_.+\.html\z} }
 
 set :css_dir,    'stylesheets'
 set :js_dir,     'javascripts'