diff --git a/qutebrowser/browser/browsertab.py b/qutebrowser/browser/browsertab.py
index 4c26f91a9..ed07bd27c 100644
--- a/qutebrowser/browser/browsertab.py
+++ b/qutebrowser/browser/browsertab.py
@@ -1015,7 +1015,7 @@ class AbstractTab(QWidget):
         self._progress = perc
         self.load_progress.emit(perc)
 
-    def url(self, requested: bool = False) -> QUrl:
+    def url(self, *, requested: bool = False) -> QUrl:
         raise NotImplementedError
 
     def progress(self) -> int:
diff --git a/qutebrowser/browser/webengine/webenginetab.py b/qutebrowser/browser/webengine/webenginetab.py
index 4d8db5537..ecbbd0ab0 100644
--- a/qutebrowser/browser/webengine/webenginetab.py
+++ b/qutebrowser/browser/webengine/webenginetab.py
@@ -1139,7 +1139,7 @@ class WebEngineTab(browsertab.AbstractTab):
         self._openurl_prepare(url, predict=predict)
         self._widget.load(url)
 
-    def url(self, requested=False):
+    def url(self, *, requested=False):
         page = self._widget.page()
         if requested:
             return page.requestedUrl()
diff --git a/tests/helpers/stubs.py b/tests/helpers/stubs.py
index 4abd58baf..0c2119132 100644
--- a/tests/helpers/stubs.py
+++ b/tests/helpers/stubs.py
@@ -268,7 +268,7 @@ class FakeWebTab(browsertab.AbstractTab):
         wrapped = QWidget()
         self._layout.wrap(self, wrapped)
 
-    def url(self, requested=False):
+    def url(self, *, requested=False):
         assert not requested
         return self._url