diff --git a/config/application.rb b/config/application.rb
index 851720f0..e0e049b9 100644
--- a/config/application.rb
+++ b/config/application.rb
@@ -38,5 +38,8 @@ module AgendaDuLibreRails
 
     # config.quiet_assets = false
     config.sass.preferred_syntax = :sass
+
+    config.action_dispatch.default_headers
+      .merge! 'X-Frame-Options' => 'ALLOWALL'
   end
 end