diff --git a/Pilz.Cryptography/IUniquieID.cs b/Pilz.Cryptography/IUniquieID.cs
index 34bc49e..b5ffa1d 100644
--- a/Pilz.Cryptography/IUniquieID.cs
+++ b/Pilz.Cryptography/IUniquieID.cs
@@ -1,9 +1,11 @@
-using System;
+using Newtonsoft.Json;
+using System;
 using System.Collections.Generic;
 using System.Text;
 
 namespace Pilz.Cryptography
 {
+    [JsonConverter(typeof(Json.Converters.UniquieIDStringJsonConverter))]
     public interface IUniquieID
     {
         bool HasID { get; }