diff --git a/.rubocop.yml b/.rubocop.yml
index cdfb67d2..cfd46810 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -61,8 +61,6 @@ Style/FrozenStringLiteralComment:
   Enabled: false
 Style/EvalWithLocation:
   Enabled: false
-Style/Lambda:
-  Enabled: false
 Style/ClassVars:
   Enabled: false
 Style/GlobalVars:
diff --git a/middleman-core/lib/middleman-core/application.rb b/middleman-core/lib/middleman-core/application.rb
index be29dc23..0b9a759b 100644
--- a/middleman-core/lib/middleman-core/application.rb
+++ b/middleman-core/lib/middleman-core/application.rb
@@ -191,7 +191,7 @@ module Middleman
         ignored
       end,
 
-      layout: ->(file, app) {
+      layout: lambda { |file, app|
         file[:relative_path].to_s.start_with?('layout.', app.config[:layouts_dir] + '/')
       }
     }, 'Callbacks that can exclude paths from the sitemap'