diff --git a/tests/unit/browser/test_adblock.py b/tests/unit/browser/test_adblock.py
index e4e7a0eda..ec43aa772 100644
--- a/tests/unit/browser/test_adblock.py
+++ b/tests/unit/browser/test_adblock.py
@@ -429,7 +429,7 @@ def test_config_change(config_stub, basedir, download_stub,
 
     host_blocker = adblock.HostBlocker()
     host_blocker.read_hosts()
-    config_stub.set_obj('content.host_blocking.lists', None)
+    config_stub.val.content.host_blocking.lists = None
     host_blocker.read_hosts()
     for str_url in URLS_TO_CHECK:
         assert not host_blocker.is_blocked(QUrl(str_url))
diff --git a/tests/unit/browser/test_history.py b/tests/unit/browser/test_history.py
index 7c6d4af45..2f4827b0a 100644
--- a/tests/unit/browser/test_history.py
+++ b/tests/unit/browser/test_history.py
@@ -226,8 +226,7 @@ class TestAdd:
 
     def test_exclude(self, hist, config_stub):
         """Excluded URLs should be in the history but not completion."""
-        config_stub.set_obj('completion.web_history.exclude',
-                            ['*.example.org'])
+        config_stub.val.completion.web_history.exclude = ['*.example.org']
         url = QUrl('http://www.example.org/')
         hist.add_from_tab(url, url, 'title')
         assert list(hist)
@@ -489,8 +488,7 @@ class TestRebuild:
 
         This setting should only be used for the completion.
         """
-        config_stub.set_obj('completion.web_history.exclude',
-                            ['*.example.org'])
+        config_stub.val.completion.web_history.exclude = ['*.example.org']
         assert hist.metainfo['force_rebuild']
 
         hist.add_url(QUrl('http://example.com'), redirect=False, atime=1)
@@ -500,7 +498,7 @@ class TestRebuild:
         assert list(hist2.completion) == [('http://example.com', '', 1)]
 
     def test_unrelated_config_change(self, config_stub, hist):
-        config_stub.set_obj('history_gap_interval', 1234)
+        config_stub.val.history_gap_interval = 1234
         assert not hist.metainfo['force_rebuild']
 
 
diff --git a/tests/unit/browser/test_qutescheme.py b/tests/unit/browser/test_qutescheme.py
index 9cc8ad31d..27caaeb6f 100644
--- a/tests/unit/browser/test_qutescheme.py
+++ b/tests/unit/browser/test_qutescheme.py
@@ -136,7 +136,7 @@ class TestHistoryHandler:
 
     def test_exclude(self, fake_web_history, now, config_stub):
         """Make sure the completion.web_history.exclude setting is not used."""
-        config_stub.set_obj('completion.web_history.exclude', ['www.x.com'])
+        config_stub.val.completion.web_history.exclude = ['www.x.com']
 
         url = QUrl("qute://history/data?start_time={}".format(now))
         _mimetype, data = qutescheme.qute_history(url)
diff --git a/tests/unit/mainwindow/test_messageview.py b/tests/unit/mainwindow/test_messageview.py
index 64468bcfb..cd7c40bc3 100644
--- a/tests/unit/mainwindow/test_messageview.py
+++ b/tests/unit/mainwindow/test_messageview.py
@@ -81,7 +81,7 @@ def test_changing_timer_with_messages_shown(qtbot, view, config_stub):
     config_stub.val.messages.timeout = 900000  # 15s
     view.show_message(usertypes.MessageLevel.info, 'test')
     with qtbot.waitSignal(view._clear_timer.timeout):
-        config_stub.set_obj('messages.timeout', 100)
+        config_stub.val.messages.timeout = 100
 
 
 @pytest.mark.parametrize('count, expected', [(1, 100), (3, 300),