diff --git a/src/Mandrill/Models/SearchResult.cs b/src/Mandrill/Models/SearchResult.cs
index 9d25c4c..b4febab 100644
--- a/src/Mandrill/Models/SearchResult.cs
+++ b/src/Mandrill/Models/SearchResult.cs
@@ -139,7 +139,7 @@ public class SearchResult
     ///   Gets or sets the ts.
     /// </summary>
     [JsonProperty("ts")]
-    public int Ts { get; set; }
+    public long Ts { get; set; }
 
     /// <summary>
     ///   Gets or sets the open details.