diff --git a/lib/ddtrace/contrib/rails/utils.rb b/lib/ddtrace/contrib/rails/utils.rb
index ebd2518263b..16789e422b1 100644
--- a/lib/ddtrace/contrib/rails/utils.rb
+++ b/lib/ddtrace/contrib/rails/utils.rb
@@ -26,7 +26,9 @@ def self.normalize_template_name(name)
         end
 
         def self.app_name
-          if ::Rails::VERSION::MAJOR >= 4
+          if ::Rails::VERSION::MAJOR >= 6
+            ::Rails.application.class.module_parent_name.underscore
+          elsif ::Rails::VERSION::MAJOR >= 4
             ::Rails.application.class.parent_name.underscore
           else
             ::Rails.application.class.to_s.underscore