diff --git a/qutebrowser/browser/webengine/webenginetab.py b/qutebrowser/browser/webengine/webenginetab.py
index 9fe0704c9..9bbe1b8aa 100644
--- a/qutebrowser/browser/webengine/webenginetab.py
+++ b/qutebrowser/browser/webengine/webenginetab.py
@@ -371,7 +371,8 @@ class WebEngineHistory(browsertab.AbstractHistory):
     def serialize(self):
         # WORKAROUND for https://bugreports.qt.io/browse/QTBUG-59599
         if self._history.count() == 0:
-            raise browsertab.WebTabError("Can't serialize page without history!")
+            raise browsertab.WebTabError("Can't serialize page without "
+                                         "history!")
         # WORKAROUND for https://github.com/qutebrowser/qutebrowser/issues/2289
         # FIXME:qtwebengine can we get rid of this with Qt 5.8.1?
         scheme = self._history.currentItem().url().scheme()