diff --git a/CoinGecko.Net/Objects/Models/CoinGeckoMarket.cs b/CoinGecko.Net/Objects/Models/CoinGeckoMarket.cs
index 1be3a93..1050822 100644
--- a/CoinGecko.Net/Objects/Models/CoinGeckoMarket.cs
+++ b/CoinGecko.Net/Objects/Models/CoinGeckoMarket.cs
@@ -39,7 +39,7 @@ public class CoinGeckoMarket
         /// Market cap rank
         /// </summary>
         [JsonProperty("market_cap_rank")]
-        public decimal MarketCapRank { get; set; }
+        public decimal? MarketCapRank { get; set; }
         /// <summary>
         /// Fully diluted valuation
         /// </summary>