diff --git a/tests/mocked.py b/tests/mocked.py
index d28cdbba..e1e4097c 100644
--- a/tests/mocked.py
+++ b/tests/mocked.py
@@ -65,6 +65,9 @@ class MockTheme:
         self.guiFontBU = QFont()
         return
 
+    def initThemes(self) -> None:
+        return
+
     def getPixmap(self, *a) -> QPixmap:
         return QPixmap()
 
diff --git a/tests/test_dialogs/test_dlg_preferences.py b/tests/test_dialogs/test_dlg_preferences.py
index ccb77133..1c54da98 100644
--- a/tests/test_dialogs/test_dlg_preferences.py
+++ b/tests/test_dialogs/test_dlg_preferences.py
@@ -31,6 +31,7 @@ from novelwriter.config import DEF_GUI_DARK, DEF_GUI_LIGHT
 from novelwriter.constants import nwUnicode
 from novelwriter.dialogs.preferences import GuiPreferences
 from novelwriter.dialogs.quotes import GuiQuoteSelect
+from novelwriter.gui.theme import ThemeEntry
 from novelwriter.types import QtDialogCancel, QtDialogSave, QtModNone
 
 KEY_DELAY = 1
@@ -147,12 +148,12 @@ def testDlgPreferences_Settings(qtbot, monkeypatch, nwGUI, fncPath, tstPaths):
     (fncPath / "nw_en_US.qm").touch()
     (fncPath / "project_en_US.json").touch()
     CONFIG._nwLangPath = fncPath
-    SHARED.theme._themeList = [
-        ("theme1", "Theme 1", False),
-        ("theme2", "Theme 2", False),
-        ("theme3", "Theme 3", True),
-        ("theme4", "Theme 4", True),
-    ]
+    SHARED.theme._allThemes = {
+        "theme1": ThemeEntry(name="Theme 1", dark=False, path=fncPath),
+        "theme2": ThemeEntry(name="Theme 2", dark=False, path=fncPath),
+        "theme3": ThemeEntry(name="Theme 3", dark=True, path=fncPath),
+        "theme4": ThemeEntry(name="Theme 4", dark=True, path=fncPath),
+    }
 
     prefs = GuiPreferences(nwGUI)
     with qtbot.waitExposed(prefs):