diff --git a/tests/test_gui_integration.py b/tests/test_gui_integration.py
index fdcd8da..b357737 100644
--- a/tests/test_gui_integration.py
+++ b/tests/test_gui_integration.py
@@ -31,6 +31,7 @@ def app(ips_path):
     app_thread = app_view.show(threaded=True)
     yield app
     app_thread.stop()
+    app_thread.join()
 
 
 def test_app_run_problem_smoke(app, test_scenes_path):