diff --git a/tests/helpers/fixtures.py b/tests/helpers/fixtures.py
index cfaba7a55..b183933d2 100644
--- a/tests/helpers/fixtures.py
+++ b/tests/helpers/fixtures.py
@@ -441,6 +441,7 @@ def fake_save_manager():
 def fake_args(request):
     ns = types.SimpleNamespace()
     ns.backend = 'webengine' if request.config.webengine else 'webkit'
+    ns.debug_flags = []
     objreg.register('args', ns)
     yield ns
     objreg.delete('args')