diff --git a/lib/active_storage/engine.rb b/lib/active_storage/engine.rb
index 95ed021ce0..71861b84ae 100644
--- a/lib/active_storage/engine.rb
+++ b/lib/active_storage/engine.rb
@@ -24,7 +24,7 @@ module ActiveStorage
 
     initializer "active_storage.verifier" do
       config.after_initialize do |app|
-        ActiveStorage.verifier = Rails.application.message_verifier("ActiveStorage")
+        ActiveStorage.verifier = app.message_verifier("ActiveStorage")
       end
     end