diff --git a/src/Discord.Net/Models/Message.cs b/src/Discord.Net/Models/Message.cs
index 2c7a80e19..ac87463d9 100644
--- a/src/Discord.Net/Models/Message.cs
+++ b/src/Discord.Net/Models/Message.cs
@@ -16,7 +16,7 @@ namespace Discord
 		Failed
 	}
 
-	public sealed class Message : CachedObject<long>
+	public sealed class Message : CachedObject<ulong>
 	{
 		internal class ImportResolver : DefaultContractResolver
 		{