diff --git a/qutebrowser/browser/network/networkreply.py b/qutebrowser/browser/network/networkreply.py
index 380767ea5..9205b655a 100644
--- a/qutebrowser/browser/network/networkreply.py
+++ b/qutebrowser/browser/network/networkreply.py
@@ -127,7 +127,7 @@ class ErrorNetworkReply(QNetworkReply):
         """We always have 0 bytes available."""
         return 0
 
-    def readData(self):
+    def readData(self, _maxlen):
         """No data available."""
         return bytes()
 
diff --git a/tests/unit/browser/network/test_networkreply.py b/tests/unit/browser/network/test_networkreply.py
index c7e11907d..d526cf2f6 100644
--- a/tests/unit/browser/network/test_networkreply.py
+++ b/tests/unit/browser/network/test_networkreply.py
@@ -88,6 +88,6 @@ def test_error_network_reply(qtbot, req):
     assert reply.isFinished()
     assert not reply.isRunning()
     assert reply.bytesAvailable() == 0
-    assert reply.readData() == b''
+    assert reply.readData(1) == b''
     assert reply.error() == QNetworkReply.UnknownNetworkError
     assert reply.errorString() == "This is an error"