diff --git a/shop/rest/fields.py b/shop/rest/fields.py
index 47bbd3202..26f2bf97d 100644
--- a/shop/rest/fields.py
+++ b/shop/rest/fields.py
@@ -20,6 +20,9 @@ class JSONSerializerField(serializers.Field):
     """
     Serializer field which transparently bypasses its object instead of serializing/deserializing.
     """
+    def __init__(self, encoder=None, **kwargs):
+        super(JSONSerializerField, self).__init__(**kwargs)
+
     def to_representation(self, obj):
         return obj