diff --git a/EnvelopeGenerator.Domain/Entities/EnvelopeType.cs b/EnvelopeGenerator.Domain/Entities/EnvelopeType.cs
index 58434917..40f7847d 100644
--- a/EnvelopeGenerator.Domain/Entities/EnvelopeType.cs
+++ b/EnvelopeGenerator.Domain/Entities/EnvelopeType.cs
@@ -1,5 +1,7 @@
 using System.ComponentModel.DataAnnotations;
 using System.ComponentModel.DataAnnotations.Schema;
+using EnvelopeGenerator.Domain.Constants;
+
 #if NETFRAMEWORK
 using System;
 #endif
@@ -56,7 +58,7 @@ namespace EnvelopeGenerator.Domain.Entities
         public int? ReminderIntervalDays { get; set; }
 
         [Column("CONTRACT_TYPE")]
-        public int? ContractType { get; set; }
+        public ContractType? ContractType { get; set; }
 
         [NotMapped]
         public bool TFA_Enabled { get; set; } = false;