diff --git a/apps/contacts/ajax/contact/addproperty.php b/apps/contacts/ajax/contact/addproperty.php
index df064367ef..1412cad1cb 100644
--- a/apps/contacts/ajax/contact/addproperty.php
+++ b/apps/contacts/ajax/contact/addproperty.php
@@ -147,6 +147,6 @@ if(!OC_Contacts_VCard::edit($id, $vcard)) {
 OCP\JSON::success(array(
 	'data' => array(
 		'checksum' => $checksum,
-		'lastmodified' => OC_Contacts_VCard::lastModified($vcard)->format('U'))
+		'lastmodified' => OC_Contacts_App::lastModified($vcard)->format('U'))
 	)
 );
diff --git a/apps/contacts/ajax/contact/deleteproperty.php b/apps/contacts/ajax/contact/deleteproperty.php
index d7545ff1fb..b76eb19462 100644
--- a/apps/contacts/ajax/contact/deleteproperty.php
+++ b/apps/contacts/ajax/contact/deleteproperty.php
@@ -47,6 +47,6 @@ if(!OC_Contacts_VCard::edit($id, $vcard)) {
 OCP\JSON::success(array(
 	'data' => array(
 		'id' => $id,
-		'lastmodified' => OC_Contacts_VCard::lastModified($vcard)->format('U'),
+		'lastmodified' => OC_Contacts_App::lastModified($vcard)->format('U'),
 	)
 ));