diff --git a/.github/workflows/test-gui.yml b/.github/workflows/test-gui.yml
index fc4b312..3cc5067 100644
--- a/.github/workflows/test-gui.yml
+++ b/.github/workflows/test-gui.yml
@@ -27,7 +27,7 @@ jobs:
         sudo apt-get update
         sudo apt-get install -y xvfb
         python -m pip install --upgrade pip
-        pip install pyqt5 pytest setuptools
+        pip install pyqt5 pytest setuptools pytest-qt
 
     - name: Start Xvfb
       run: |
@@ -36,4 +36,4 @@ jobs:
 
     - name: Run GUI test
       run: |
-        python tests/test_result_gui_viewer.py --durations=0 -v
+        xvfb-run pytest tests/test_result_gui_viewer.py --durations=0 -v
diff --git a/tests/test_result_gui_viewer.py b/tests/test_result_gui_viewer.py
index 950f0fd..4f70222 100644
--- a/tests/test_result_gui_viewer.py
+++ b/tests/test_result_gui_viewer.py
@@ -42,7 +42,7 @@ def test_result_gui_viewer():
     # Print summary of simulation result
     W.analyzer.print_simple_stats()
 
-    ResultGUIViewer.launch_World_viewer(W, return_app_window=False)
+    app, window = ResultGUIViewer.launch_World_viewer(W, return_app_window=True)
 
     # Shut down 5 sec later
     from PyQt5.QtCore import QTimer