diff --git a/actionmailer/test/old_base/mail_service_test.rb b/actionmailer/test/old_base/mail_service_test.rb
index 8a677df9a8..9eb067554f 100644
--- a/actionmailer/test/old_base/mail_service_test.rb
+++ b/actionmailer/test/old_base/mail_service_test.rb
@@ -784,7 +784,7 @@ def test_utf8_body_is_not_quoted
     expected.date    = Time.local 2004, 12, 12
 
     created = TestMailer.utf8_body @recipient
-    assert_match(/åœö blah/, created.encoded)
+    assert_match(/åœö blah/, created.decoded)
   end
 
   def test_multiple_utf8_recipients