diff --git a/ZendeskApi_v2/Models/Tickets/Ticket.cs b/ZendeskApi_v2/Models/Tickets/Ticket.cs
index e3d55145..299ab7c8 100644
--- a/ZendeskApi_v2/Models/Tickets/Ticket.cs
+++ b/ZendeskApi_v2/Models/Tickets/Ticket.cs
@@ -70,7 +70,7 @@ public class Ticket : BaseTicket
         public bool? HasIncidents { get; set; }
 
         [JsonProperty("due_at")]
-        public string DueAt { get; set; }
+        public string DueAt? { get; set; }
 
         [JsonProperty("tags")]
         public IList<string> Tags { get; set; }