diff --git a/tests/unit/commands/test_argparser.py b/tests/unit/commands/test_argparser.py
index 7c33e257a..8e7ce0938 100644
--- a/tests/unit/commands/test_argparser.py
+++ b/tests/unit/commands/test_argparser.py
@@ -47,10 +47,8 @@ class TestArgumentParser:
     @pytest.yield_fixture
     def tabbed_browser(self, win_registry):
         tb = FakeTabbedBrowser()
-        objreg.register('last-focused-main-window', win_registry[0])
         objreg.register('tabbed-browser', tb, scope='window', window=0)
         yield tb
-        objreg.delete('last-focused-main-window')
         objreg.delete('tabbed-browser', scope='window', window=0)
 
     def test_name(self, parser):