diff --git a/tests/unit/browser/test_history.py b/tests/unit/browser/test_history.py
index 2462a1141..7b34090f2 100644
--- a/tests/unit/browser/test_history.py
+++ b/tests/unit/browser/test_history.py
@@ -30,8 +30,9 @@ from qutebrowser.commands import cmdexc
 
 
 @pytest.fixture(autouse=True)
-def prerequisites(config_stub, fake_save_manager, init_sql):
+def prerequisites(config_stub, fake_save_manager, init_sql, fake_args):
     """Make sure everything is ready to initialize a WebHistory."""
+    fake_args.debug_flags = []
     config_stub.data = {'general': {'private-browsing': False}}
 
 
diff --git a/tests/unit/browser/test_qutescheme.py b/tests/unit/browser/test_qutescheme.py
index 693b2607c..02e0c484d 100644
--- a/tests/unit/browser/test_qutescheme.py
+++ b/tests/unit/browser/test_qutescheme.py
@@ -105,8 +105,9 @@ class TestHistoryHandler:
         objreg.delete('web-history')
 
     @pytest.fixture(autouse=True)
-    def fake_history(self, fake_web_history, entries):
+    def fake_history(self, fake_web_history, fake_args, entries):
         """Create fake history."""
+        fake_args.debug_flags = []
         for item in entries:
             fake_web_history.add_url(**item)
 
diff --git a/tests/unit/completion/test_models.py b/tests/unit/completion/test_models.py
index f495f728f..ee7726422 100644
--- a/tests/unit/completion/test_models.py
+++ b/tests/unit/completion/test_models.py
@@ -314,6 +314,12 @@ def test_bookmark_completion_delete(qtmodeltester, bookmarks, row, removed):
     assert before.difference(after) == {removed}
 
 
+@pytest.fixture(autouse=True)
+def url_args(fake_args):
+    """Prepare arguments needed to test the URL completion."""
+    fake_args.debug_flags = []
+
+
 def test_url_completion(qtmodeltester, web_history_populated,
                         quickmarks, bookmarks, info):
     """Test the results of url completion.