diff --git a/src/Model/User.cs b/src/Model/User.cs
index 358feb1..e0daf45 100644
--- a/src/Model/User.cs
+++ b/src/Model/User.cs
@@ -3,6 +3,7 @@
 namespace sodoff.Model;
 public class User {
     [Key]
+    [MaxLength(255)]
     public Guid Id { get; set; }
 
     [Required]