diff --git a/tests/test_base/test_base_config.py b/tests/test_base/test_base_config.py
index d155b6e7..1197ec19 100644
--- a/tests/test_base/test_base_config.py
+++ b/tests/test_base/test_base_config.py
@@ -202,7 +202,8 @@ def testBaseConfig_Init(monkeypatch, tmpDir, fncDir, outDir, refDir, filesDir):
     writeFile(os.path.join(i18nDir, "nw_en_GB.ts"), "")
     writeFile(os.path.join(i18nDir, "nw_abcd.qm"), "")
 
-    tstConf.initLocalisation(DummyApp)
+    tstApp = DummyApp()
+    tstConf.initLocalisation(tstApp)
     theList = tstConf.listLanguages()
     assert theList == [("en_GB", "British English")]