diff --git a/test/test_sams_hub.py b/test/test_sams_hub.py
index 6e2e94a759f41befe69c331ad806c75b1eece448..08ef387410149d24b198201d9e965e7d73fca89f 100644
--- a/test/test_sams_hub.py
+++ b/test/test_sams_hub.py
@@ -53,7 +53,7 @@ class CaseSAMSHubWithMainApp(unittest.TestCase):
       with self.subTest(main_app = main_app, extra_app = extra_app):
         hub = SAMSHub(
           name = 'test',
-          config = {'default_language': 'de', 'main_app' : main_app}
+          config = {'default_language': 'de', 'main_app' : ''.join(main_app)}
         )
         expected_names = [
           'Hauptanwendung Punkt 1', 'Hauptanwendung Punkt 2',