diff --git a/combo/apps/lingo/views.py b/combo/apps/lingo/views.py
index 4d6f03a5..1f75ab14 100644
--- a/combo/apps/lingo/views.py
+++ b/combo/apps/lingo/views.py
@@ -890,7 +890,7 @@ class TransactionStatusApiView(View):
         except (Transaction.DoesNotExist, ValueError):
             return HttpResponseNotFound(_('Unknown transaction.'))
 
-        user = request.user if request.user.is_authenticated() else None
+        user = request.user if request.user.is_authenticated else None
         error_msg = _('Transaction does not belong to the requesting user')
         if user and transaction.user and user != transaction.user:
             return HttpResponseForbidden(error_msg)