diff --git a/test/functional/messages_controller_test.rb b/test/functional/messages_controller_test.rb
index f5760b08fd..eb98ccaf69 100644
--- a/test/functional/messages_controller_test.rb
+++ b/test/functional/messages_controller_test.rb
@@ -159,10 +159,11 @@ class MessagesControllerTest < Redmine::ControllerTest
       assert_mail_body_match 'Message body', mail
     end
 
+    email_addresses = mails.map(&:to)
     # author
-    assert_equal ['jsmith@somenet.foo'], mails[0].to
+    assert_includes email_addresses, ['jsmith@somenet.foo']
     # project member
-    assert_equal ['dlopper@somenet.foo'], mails[1].to
+    assert_includes email_addresses, ['dlopper@somenet.foo']
   end
 
   def test_get_edit