diff --git a/Koha/Biblio/ItemGroup.pm b/Koha/Biblio/ItemGroup.pm
index 8c4ba66db1..9525a0fe0a 100644
--- a/Koha/Biblio/ItemGroup.pm
+++ b/Koha/Biblio/ItemGroup.pm
@@ -131,12 +131,4 @@ sub _type {
     return 'ItemGroup';
 }
 
-=head3 object_class
-
-=cut
-
-sub object_class {
-    return 'Koha::Biblio::ItemGroup';
-}
-
 1;
diff --git a/Koha/Biblio/ItemGroup/Item.pm b/Koha/Biblio/ItemGroup/Item.pm
index 17a175f302..9587c90a0b 100644
--- a/Koha/Biblio/ItemGroup/Item.pm
+++ b/Koha/Biblio/ItemGroup/Item.pm
@@ -39,8 +39,4 @@ sub _type {
 
 =cut
 
-sub object_class {
-    return 'Koha::Biblio::ItemGroup::Item';
-}
-
 1;