diff --git a/qutebrowser/browser/webkit/webkittab.py b/qutebrowser/browser/webkit/webkittab.py
index 2a7fcc3b4..6fefaa655 100644
--- a/qutebrowser/browser/webkit/webkittab.py
+++ b/qutebrowser/browser/webkit/webkittab.py
@@ -624,8 +624,8 @@ class WebKitTab(browsertab.AbstractTab):
     def run_js_async(self, code, callback=None, *, world=None):
         if world is not None and world != usertypes.JsWorld.jseval:
             log.webview.warning("Ignoring world ID {}".format(world))
-        result = self._widget.page().mainFrame().documentElement() \
-            .evaluateJavaScript(code)
+        document_element = self._widget.page().mainFrame().documentElement()
+        result = document_element.evaluateJavaScript(code)
         if callback is not None:
             callback(result)