diff --git a/tests/test-unique.c b/tests/test-unique.c
index b7cde45..c9958c9 100644
--- a/tests/test-unique.c
+++ b/tests/test-unique.c
@@ -82,9 +82,11 @@ app_message_cb (UniqueApp         *app,
                                    GTK_DIALOG_DESTROY_WITH_PARENT,
                                    GTK_MESSAGE_INFO,
                                    GTK_BUTTONS_CLOSE,
+                                   "%s",
                                    title);
   if (message)
     gtk_message_dialog_format_secondary_text (GTK_MESSAGE_DIALOG (dialog),
+                                              "%s",
                                               message);
 
   gtk_window_set_urgency_hint (GTK_WINDOW (dialog), TRUE);