diff --git a/EduNetworkBuilder/SchoolworkClass.cs b/EduNetworkBuilder/SchoolworkClass.cs
index 7822d20..1b0c378 100644
--- a/EduNetworkBuilder/SchoolworkClass.cs
+++ b/EduNetworkBuilder/SchoolworkClass.cs
@@ -63,6 +63,7 @@ namespace EduNetworkBuilder
         }
         public static void Clone(SchoolworkClass source, SchoolworkClass dest)
         {
+            dest.ThisID = source.ThisID;
             dest.Class = source.Class;
             dest.Description = source.Description;
             dest.DueDate = source.DueDate;