diff --git a/OKX.Net/Objects/Public/OKXDiscountInfo.cs b/OKX.Net/Objects/Public/OKXDiscountInfo.cs
index 15ff847..a4e92ee 100644
--- a/OKX.Net/Objects/Public/OKXDiscountInfo.cs
+++ b/OKX.Net/Objects/Public/OKXDiscountInfo.cs
@@ -21,7 +21,7 @@ public record OKXDiscountInfo
     /// Discount level
     /// </summary>
     [JsonPropertyName("discountLv")]
-    public int DiscountLevel { get; set; }
+    public int? DiscountLevel { get; set; }
 
     /// <summary>
     /// Minimal discount rate