diff --git a/Koha/Biblio.pm b/Koha/Biblio.pm
index 0af49b939e..5a1be3cfe2 100644
--- a/Koha/Biblio.pm
+++ b/Koha/Biblio.pm
@@ -1130,7 +1130,8 @@ sub to_api_mapping {
         unititle         => 'uniform_title',
         seriestitle      => 'series_title',
         copyrightdate    => 'copyright_date',
-        datecreated      => 'creation_date'
+        datecreated      => 'creation_date',
+        deleted_on       => undef,
     };
 }
 
diff --git a/Koha/Item.pm b/Koha/Item.pm
index 4dc41b9d78..b3ac362334 100644
--- a/Koha/Item.pm
+++ b/Koha/Item.pm
@@ -1400,7 +1400,8 @@ sub to_api_mapping {
         enumchron                => 'serial_issue_number',
         copynumber               => 'copy_number',
         stocknumber              => 'inventory_number',
-        new_status               => 'new_status'
+        new_status               => 'new_status',
+        deleted_on               => undef,
     };
 }