diff --git a/test/functional/issues_controller_test.rb b/test/functional/issues_controller_test.rb
index 5f3f34522..951cf90be 100644
--- a/test/functional/issues_controller_test.rb
+++ b/test/functional/issues_controller_test.rb
@@ -1077,7 +1077,8 @@ class IssuesControllerTest < ActionController::TestCase
     assert_template 'new'
     issue = assigns(:issue)
     assert_not_nil issue
-    assert_equal I18n.translate('activerecord.errors.messages.invalid'), issue.errors.on(:custom_values)
+    assert_equal I18n.translate('activerecord.errors.messages.invalid'),
+                 issue.errors[:custom_values].to_s
   end
 
   def test_post_create_with_watchers