diff --git a/middleman-core/lib/middleman-core/core_extensions/i18n.rb b/middleman-core/lib/middleman-core/core_extensions/i18n.rb
index b2476796..4b2f35b4 100644
--- a/middleman-core/lib/middleman-core/core_extensions/i18n.rb
+++ b/middleman-core/lib/middleman-core/core_extensions/i18n.rb
@@ -190,7 +190,7 @@ class Middleman::CoreExtensions::Internationalization < ::Middleman::Extension
     end
   end
 
-  Contract String, Symbol => String
+  Contract String, Symbol => Maybe[String]
   def localized_path(path, locale)
     lookup_path = path.dup
     lookup_path << app.config[:index_file] if lookup_path.end_with?('/')