diff --git a/src/postorius/auth/utils.py b/src/postorius/auth/utils.py
index fc23c18..fc43e8f 100644
--- a/src/postorius/auth/utils.py
+++ b/src/postorius/auth/utils.py
@@ -20,6 +20,10 @@
 Authentication and authorization-related utilities.
 """
 
+from django.utils import six
+from postorius.utils import set_other_emails
+from postorius.models import List
+
 def user_is_in_list_roster(user, mailing_list, roster):
     if not user.is_authenticated():
         return False
@@ -32,7 +36,7 @@
 
 
 def set_user_access_props(user, mlist):
-    if not isinstance(mlist, List):
+    if isinstance(mlist, six.string_types):
         mlist = List.objects.get_or_404(mlist)
     if not hasattr(user, 'is_list_owner'):
         user.is_list_owner = user_is_in_list_roster(
diff --git a/src/postorius/views/generic.py b/src/postorius/views/generic.py
index 3b18d66..e38bfe6 100644
--- a/src/postorius/views/generic.py
+++ b/src/postorius/views/generic.py
@@ -52,7 +52,7 @@
             self.mailing_list = self._get_list(kwargs['list_id'],
                                                int(kwargs.get('page', 1)))
             utils.set_other_emails(request.user)
-            set_user_access_props(request.user)
+            set_user_access_props(request.user, self.mailing_list)
         # set the template
         if 'template' in kwargs:
             self.template = kwargs['template']