diff --git a/core/lib/spree/core/engine.rb b/core/lib/spree/core/engine.rb
index b90d4f9f924..98f47e83d9d 100644
--- a/core/lib/spree/core/engine.rb
+++ b/core/lib/spree/core/engine.rb
@@ -80,10 +80,10 @@ class Engine < ::Rails::Engine
         end
       end
 
-      initializer "spree.core.action_mailer.set_preview_path", before: "action_mailer.set_autoload_paths" do |app|
+      initializer "spree.core.action_mailer.set_preview_path", after: "action_mailer.set_autoload_paths" do |app|
         if Rails.gem_version >= Gem::Version.new('7.1.0')
-          solidus_preview_path = Spree::Core::Engine.root.join 'lib/spree/mailer_previews'
-          app.config.action_mailer.preview_paths << solidus_preview_path.to_s
+          solidus_preview_path = Spree::Core::Engine.root.join('lib/spree/mailer_previews')
+          ActionMailer::Base.preview_paths << solidus_preview_path.to_s
         end
       end