diff --git a/src/CouchJsonDocument.cs b/src/CouchJsonDocument.cs
index 65856cd..87a224b 100644
--- a/src/CouchJsonDocument.cs
+++ b/src/CouchJsonDocument.cs
@@ -47,7 +47,7 @@ public override string ToString()
 
         #region ICouchDocument Members
 
-        public void WriteJson(JsonWriter writer)
+        public virtual void WriteJson(JsonWriter writer)
         {
             foreach (JToken token in Obj.Children())
             {