diff --git a/IRaCIS.Core.Application/Service/QC/DTO/PreviousHistoryViewModel.cs b/IRaCIS.Core.Application/Service/QC/DTO/PreviousHistoryViewModel.cs
index 6a0613631..7fdf9fe66 100644
--- a/IRaCIS.Core.Application/Service/QC/DTO/PreviousHistoryViewModel.cs
+++ b/IRaCIS.Core.Application/Service/QC/DTO/PreviousHistoryViewModel.cs
@@ -91,7 +91,7 @@ namespace IRaCIS.Core.Application.Contracts
 
         public DateTime? StartTime { get; set; }
         public DateTime? EndTime { get; set; }
-        public bool IsPD { get; set; }
+        public int? IsPD { get; set; }
         public Guid SubjectVisitId { get; set; }
         public bool IsSubjectLevel { get; set; } = true;
         public string Path { get; set; } = String.Empty;