diff --git a/qutebrowser/utils/standarddir.py b/qutebrowser/utils/standarddir.py
index 61297796e..5e5da849a 100644
--- a/qutebrowser/utils/standarddir.py
+++ b/qutebrowser/utils/standarddir.py
@@ -193,10 +193,11 @@ def _writable_location(typ):
 
     # Types we are sure we handle correctly below.
     assert typ in [
-        QStandardPaths.ConfigLocation, QStandardPaths.AppDataLocation,
-        QStandardPaths.DataLocation, QStandardPaths.CacheLocation,
-        QStandardPaths.DownloadLocation, QStandardPaths.RuntimeLocation,
-        QStandardPaths.TempLocation], typ_str
+        QStandardPaths.ConfigLocation, QStandardPaths.DataLocation,
+        QStandardPaths.CacheLocation, QStandardPaths.DownloadLocation,
+        QStandardPaths.RuntimeLocation, QStandardPaths.TempLocation,
+        # FIXME old Qt
+        getattr(QStandardPaths, 'AppDataLocation', object())], typ_str
 
     with qtutils.unset_organization():
         path = QStandardPaths.writableLocation(typ)
diff --git a/tests/unit/utils/test_standarddir.py b/tests/unit/utils/test_standarddir.py
index ffeef58f2..621a00902 100644
--- a/tests/unit/utils/test_standarddir.py
+++ b/tests/unit/utils/test_standarddir.py
@@ -27,7 +27,6 @@ import types
 import textwrap
 import collections
 import logging
-import textwrap
 import subprocess
 
 from PyQt5.QtCore import QStandardPaths