diff --git a/actionmailer/test/base_test.rb b/actionmailer/test/base_test.rb
index 5d9eda2555..b218d923e5 100644
--- a/actionmailer/test/base_test.rb
+++ b/actionmailer/test/base_test.rb
@@ -287,7 +287,7 @@ class BaseTest < ActiveSupport::TestCase
       end
     end
 
-    assert_nothing_raised { LateAttachmentAccessorMailer.welcome }
+    assert_nothing_raised { LateAttachmentAccessorMailer.welcome.message }
   end
 
   # Implicit multipart