diff --git a/test/unit/user_test.rb b/test/unit/user_test.rb
index 132ddb5b2..5f7150d6e 100644
--- a/test/unit/user_test.rb
+++ b/test/unit/user_test.rb
@@ -344,7 +344,7 @@ class UserTest < ActiveSupport::TestCase
     u = User.new
     u.mail_notification = 'foo'
     u.save
-    assert_not_nil u.errors.on(:mail_notification)
+    assert_not_nil u.errors[:mail_notification]
   end
 
   context "User#try_to_login" do