diff --git a/qutebrowser/misc/lineparser.py b/qutebrowser/misc/lineparser.py
index ad8202594..1b267571f 100644
--- a/qutebrowser/misc/lineparser.py
+++ b/qutebrowser/misc/lineparser.py
@@ -191,7 +191,7 @@ class AppendLineParser(BaseLineParser):
         do_save = self._prepare_save()
         if not do_save:
             return
-        with self._open('w') as f:
+        with self._open('w'):
             pass
         self.new_data = []
         self._after_save()
@@ -254,6 +254,7 @@ class LineParser(BaseLineParser):
         self.data = []
         self.save()
 
+
 class LimitLineParser(LineParser):
 
     """A LineParser with a limited count of lines.
diff --git a/tests/unit/browser/test_cookies.py b/tests/unit/browser/test_cookies.py
index f92a4f2ca..9ff4148e2 100644
--- a/tests/unit/browser/test_cookies.py
+++ b/tests/unit/browser/test_cookies.py
@@ -57,6 +57,9 @@ class LineparserSaveStub(lineparser.BaseLineParser):
     def save(self):
         self.saved = self.data
 
+    def clear(self):
+        pass
+
     def __iter__(self):
         return iter(self.data)