diff --git a/lib/exception_notifier/modules/formatter.rb b/lib/exception_notifier/modules/formatter.rb
index ca358349..b4070421 100644
--- a/lib/exception_notifier/modules/formatter.rb
+++ b/lib/exception_notifier/modules/formatter.rb
@@ -111,7 +111,12 @@ def controller_and_action
     def rails_app_name
       return unless defined?(::Rails) && ::Rails.respond_to?(:application)
 
-      Rails.application.class.parent_name.underscore
+      
+      if Rails::VERSION::MAJOR >= 6
+        Rails.application.class.module_parent_name.underscore
+      else
+        Rails.application.class.parent_name.underscore
+      end
     end
 
     def controller