diff --git a/tests/unit/browser/webkit/network/test_pac.py b/tests/unit/browser/webkit/network/test_pac.py
index c5c12b1a1..58b518886 100644
--- a/tests/unit/browser/webkit/network/test_pac.py
+++ b/tests/unit/browser/webkit/network/test_pac.py
@@ -125,7 +125,7 @@ def test_invalid_port():
         res.resolve(QNetworkProxyQuery(QUrl("https://example.com/test")))
 
 
-@pytest.mark.parametrize(string, ["", "{"])
+@pytest.mark.parametrize('string', ["", "{"])
 def test_wrong_pac_string(string):
     with pytest.raises(pac.EvalProxyError):
         pac.PACResolver(string)