diff --git a/EosSharp/EosSharp.Core/Exceptions/ApiErrorException.cs b/EosSharp/EosSharp.Core/Exceptions/ApiErrorException.cs
index 5e018ae..6496f83 100644
--- a/EosSharp/EosSharp.Core/Exceptions/ApiErrorException.cs
+++ b/EosSharp/EosSharp.Core/Exceptions/ApiErrorException.cs
@@ -47,7 +47,7 @@ public override void GetObjectData(SerializationInfo info, StreamingContext cont
     [Serializable]
     public class ApiError
     {
-        public int code;
+        public ulong code;
         public string name;
         public string what;
         public List<ApiErrorDetail> details;