diff --git a/tests/auto/macgui/macgui.pro b/tests/auto/macgui/macgui.pro
index 7e40d81808..8a57a8c54b 100644
--- a/tests/auto/macgui/macgui.pro
+++ b/tests/auto/macgui/macgui.pro
@@ -11,3 +11,4 @@ QT = core-private gui-private
 
 requires(mac)
 
+CONFIG+=insignificant_test  # QTBUG-20984, fails unstably