diff --git a/tests/test_simulator_tab_gui.py b/tests/test_simulator_tab_gui.py
index 0d8b53f287..d3215cb4a6 100644
--- a/tests/test_simulator_tab_gui.py
+++ b/tests/test_simulator_tab_gui.py
@@ -380,10 +380,7 @@ def test_open_simulator_dialog_and_send_mismatching_message(self):
             logger.debug("Waiting for mismatching message")
             time.sleep(1)
 
-        QTest.qWait(250)
-        QApplication.processEvents()
-        QTest.qWait(100)
-
+        dialog.on_timer_timeout()  # enforce writing to text view
         simulator_log = dialog.ui.textEditSimulation.toPlainText()
         self.assertIn("Received message 1", simulator_log)
         self.assertIn("preamble: 11111111", simulator_log)