diff --git a/lib/backend/abstractbackend.php b/lib/backend/abstractbackend.php
index b6cc14d1..d9e4cadb 100644
--- a/lib/backend/abstractbackend.php
+++ b/lib/backend/abstractbackend.php
@@ -28,6 +28,12 @@ namespace OCA\Contacts\Backend;
 
 abstract class AbstractBackend {
 
+	/**
+	 * The name of the backend.
+	 * @var string
+	 */
+	public $name;
+
 	/**
 	 * Returns the list of addressbooks for a specific user.
 	 *
@@ -187,6 +193,6 @@ abstract class AbstractBackend {
 	 * @param mixed $id
 	 * @returns int | null
 	 */
-	public function lastModifiedContact($addressbookid, $contact) {
+	public function lastModifiedContact($addressbookid, $id) {
 	}
 }
\ No newline at end of file
diff --git a/lib/backend/database.php b/lib/backend/database.php
index a9dcdb28..4c7e1482 100644
--- a/lib/backend/database.php
+++ b/lib/backend/database.php
@@ -544,6 +544,21 @@ class Database extends AbstractBackend {
 		return true;
 	}
 
+	/**
+	 * @brief Get the last modification time for a contact.
+	 *
+	 * Must return a UNIX time stamp or null if the backend
+	 * doesn't support it.
+	 *
+	 * @param string $addressbookid
+	 * @param mixed $id
+	 * @returns int | null
+	 */
+	public function lastModifiedContact($addressbookid, $id) {
+		$contact = $this->getContact($addressbookid, $id);
+		return $contact ? $contact['lastmodified'] : null;
+	}
+
 	private function createAddressBookURI($displayname, $userid = null) {
 		$userid = $userid ? $userid : \OCP\User::getUser();
 		$name = str_replace(' ', '_', strtolower($displayname));
@@ -572,6 +587,4 @@ class Database extends AbstractBackend {
 		return $newname;
 	}
 
-	public function lastModifiedContact($addressbookid, $id) {
-	}
 }
diff --git a/lib/backend/shared.php b/lib/backend/shared.php
index 3b04a2f5..95163859 100644
--- a/lib/backend/shared.php
+++ b/lib/backend/shared.php
@@ -30,7 +30,7 @@ use OCA\Contacts;
 
 class Shared extends Database {
 
-	public $backendname = 'shared';
+	public $name = 'shared';
 	public $addressbooks = array();
 
 	/**