diff --git a/core/viewsets.py b/core/viewsets.py
index d8ad7745..e53c3a61 100644
--- a/core/viewsets.py
+++ b/core/viewsets.py
@@ -109,6 +109,7 @@ from payments.serializers import TransactionProcessSerializer
 
 class EvibesViewSet(ModelViewSet):
     action_serializer_classes = {}
+    additional = {}
     permission_classes = [EvibesPermission]
     renderer_classes = [CamelCaseJSONRenderer, MultiPartRenderer, XMLRenderer, YAMLRenderer]