diff --git a/CHANGELOG.md b/CHANGELOG.md
index ee99078c..b0e80a88 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -11,6 +11,7 @@ master
 * Fixed `asset_hash` when path has query string or #hashes
 * Fix new extension template
 * Don't parse frontmatter on ignored files.
+* Fix displaying frontmatter on `/__middleman/sitemap`
 
 # 4.0.0
 
diff --git a/middleman-core/lib/middleman-core/meta_pages/sitemap_resource.rb b/middleman-core/lib/middleman-core/meta_pages/sitemap_resource.rb
index d746be95..fecaef96 100644
--- a/middleman-core/lib/middleman-core/meta_pages/sitemap_resource.rb
+++ b/middleman-core/lib/middleman-core/meta_pages/sitemap_resource.rb
@@ -42,7 +42,7 @@ module Middleman
         props['Source File'] = @resource.file_descriptor ? @resource.file_descriptor[:full_path].to_s.sub(/^#{Regexp.escape(ENV['MM_ROOT'] + '/')}/, '') : 'Dynamic'
 
         data = @resource.data
-        props['Data'] = data.inspect unless data.empty?
+        props['Data'] = data.to_hash(symbolize_keys: true).inspect unless data.empty?
 
         options = @resource.options
         props['Options'] = options.inspect unless options.empty?