diff --git a/ticdesk/contextprocessors.py b/ticdesk/contextprocessors.py
index 2ed42d8c05df4e82b7494cf11b2d5adecb5a50b0..74872ce7dc4d009a5cb76d2a24fed1088bb50c54 100644
--- a/ticdesk/contextprocessors.py
+++ b/ticdesk/contextprocessors.py
@@ -5,7 +5,7 @@ TeckidsPerson = apps.get_model('ticdesk_account', 'TeckidsPerson')
 def person_context(request):
     context = {}
 
-    if request.user.is_authenticated():
+    if request.user.is_authenticated:
         person = TeckidsPerson.objects.get(uid=request.user.username)
         context['current_person'] = person
 
diff --git a/ticdesk_events/views.py b/ticdesk_events/views.py
index 81a52219b82e70c2c2329bc48c82859894c71423..ab4f74cf49c13bb479d6e965c588c33463c4eed4 100644
--- a/ticdesk_events/views.py
+++ b/ticdesk_events/views.py
@@ -33,7 +33,7 @@ def register_event(request, cn):
     context = {}
     
     # Only authenticated users an register for events
-    if not request.user.is_authenticated():
+    if not request.user.is_authenticated:
         return redirect(reverse('ticdesk_account:login') + '?next=%s' % request.path)
 
     # Get current person and event
diff --git a/ticdesk_org/util.py b/ticdesk_org/util.py
index 93de2047fc8d692d2a8d90de7921167369302b0f..20e9a164eca8aeb4aa5363811db19927f63cfce0 100644
--- a/ticdesk_org/util.py
+++ b/ticdesk_org/util.py
@@ -13,7 +13,7 @@ logger = logging.getLogger(__name__)
 
 def may_see_group(group, user):
     # Not logged-in users cannot see anything
-    if not user.is_authenticated():
+    if not user.is_authenticated:
         return False
 
     # Replace user variable it the user's TeckidsPerson
@@ -45,7 +45,7 @@ def may_see_group(group, user):
 
 def may_see_person(person, user):
     # Not logged-in users cannot see anything
-    if not user.is_authenticated():
+    if not user.is_authenticated:
         return False
 
     # Replace user variable with the user's TeckidsPerson
@@ -80,7 +80,7 @@ def filter_disallowed_persons(persons, user):
 
 def get_relevant_groups(user):
     # Not logged-in users cannot see anything
-    if not user.is_authenticated():
+    if not user.is_authenticated:
         return []
 
     # Replace user variable with the user's TeckidsPerson