diff --git a/Source/Podio .NET/Models/ItemRevision.cs b/Source/Podio .NET/Models/ItemRevision.cs
index ada7721..4d60a79 100644
--- a/Source/Podio .NET/Models/ItemRevision.cs	
+++ b/Source/Podio .NET/Models/ItemRevision.cs	
@@ -9,7 +9,7 @@ public class ItemRevision
         public int Revision { get; set; }
 
         [JsonProperty("item_revision_id")]
-        public int? ItemRevisionId { get; set; }
+        public long? ItemRevisionId { get; set; }
 
         [JsonProperty("app_revision")]
         public int? AppRevision { get; set; }
@@ -26,4 +26,4 @@ public class ItemRevision
         [JsonProperty("type")]
         public string Type { get; set; }
     }
-}
\ No newline at end of file
+}