diff --git a/orchestra/api/root.py b/orchestra/api/root.py
index 12551571..51fa23c1 100644
--- a/orchestra/api/root.py
+++ b/orchestra/api/root.py
@@ -11,7 +11,7 @@ class APIRoot(views.APIView):
         'ORCHESTRA_SITE_NAME',
         'ORCHESTRA_SITE_VERBOSE_NAME'
     )
-    
+
     def get(self, request, format=None):
         root_url = reverse('api-root', request=request, format=format)
         token_url = reverse('api-token-auth', request=request, format=format)
@@ -23,7 +23,7 @@ class APIRoot(views.APIView):
             'accountancy': {},
             'services': {},
         }
-        if not request.user.is_anonymous():
+        if not request.user.is_anonymous:
             list_name = '{basename}-list'
             detail_name = '{basename}-detail'
             for prefix, viewset, basename in self.router.registry:
@@ -60,7 +60,7 @@ class APIRoot(views.APIView):
                 for name in self.names
         })
         return Response(body, headers=headers)
-    
+
     def options(self, request):
         metadata = super(APIRoot, self).options(request)
         metadata.data['settings'] = {
diff --git a/orchestra/permissions/api.py b/orchestra/permissions/api.py
index 7f8dc251..5e72aae8 100644
--- a/orchestra/permissions/api.py
+++ b/orchestra/permissions/api.py
@@ -14,7 +14,7 @@ class OrchestraPermissionBackend(DjangoModelPermissions):
         model_cls = queryset.model
         perms = self.get_required_permissions(request.method, model_cls)
         if (request.user and
-            request.user.is_authenticated() and
+            request.user.is_authenticated and
             request.user.has_perms(perms, model_cls)):
             return True
         return False
@@ -22,7 +22,7 @@ class OrchestraPermissionBackend(DjangoModelPermissions):
     def has_object_permission(self, request, view, obj):
         perms = self.get_required_permissions(request.method, type(obj))
         if (request.user and
-            request.user.is_authenticated() and
+            request.user.is_authenticated and
             request.user.has_perms(perms, obj)):
             return True
         return False