diff --git a/Safe2Pay/Response/PlanResponse.cs b/Safe2Pay/Response/PlanResponse.cs
index 079acc6..e658657 100644
--- a/Safe2Pay/Response/PlanResponse.cs
+++ b/Safe2Pay/Response/PlanResponse.cs
@@ -22,7 +22,7 @@ public class PlanResponse
         public bool IsEnabled { get; set; }
         public bool IsImmediateCharge { get; set; }
         public string CallbackUrl { get; set; }
-        public DateTime ExpirationDate { get; set; }
+        public DateTime? ExpirationDate { get; set; }
         public DateTime CreatedDate { get; set; }
         public int DaysDue { get; set; }
         public int DaysBeforeCancel { get; set; }