diff --git a/Tasks/AddressCreation.cs b/Tasks/AddressCreation.cs
index e1f3105..0c937ec 100644
--- a/Tasks/AddressCreation.cs
+++ b/Tasks/AddressCreation.cs
@@ -104,6 +104,7 @@ public static class AddressCreator
         // Alternative A: pplz valid and city existing
         if (!string.IsNullOrEmpty(address.ort) && CheckPLZ(address.pplz, address.land))
         {
+            KasPerson.SetUsedPLZ(id, address.pplz);
             string_address = address.pplz + " " + address.ort + "\n" + string_address;
             address_line_count++;
             if (!string.IsNullOrWhiteSpace(address.postfach))
@@ -150,6 +151,7 @@ public static class AddressCreator
         } // Alternative B: plz valid and city existing 
         else if (!string.IsNullOrEmpty(address.ort) && CheckPLZ(address.plz, address.land))
         {
+            KasPerson.SetUsedPLZ(id, address.plz);
             string_address = address.plz + " " + address.ort + "\n" + string_address;
             address_line_count++;
             if (!string.IsNullOrWhiteSpace(address.strasse))