diff --git a/lib/GroupBackend.php b/lib/GroupBackend.php
index 46d08ad98..a80667721 100644
--- a/lib/GroupBackend.php
+++ b/lib/GroupBackend.php
@@ -15,10 +15,11 @@
 use OCP\Group\Backend\IGetDisplayNameBackend;
 use OCP\Group\Backend\INamedBackend;
 use OCP\Group\Backend\IRemoveFromGroupBackend;
+use OCP\Group\Backend\ISetDisplayNameBackend;
 use OCP\IDBConnection;
 use Psr\Log\LoggerInterface;
 
-class GroupBackend extends ABackend implements IAddToGroupBackend, ICountUsersBackend, ICreateGroupBackend, IDeleteGroupBackend, IGetDisplayNameBackend, IRemoveFromGroupBackend, INamedBackend {
+class GroupBackend extends ABackend implements IAddToGroupBackend, ICountUsersBackend, ICreateGroupBackend, IDeleteGroupBackend, IGetDisplayNameBackend, IRemoveFromGroupBackend, INamedBackend, ISetDisplayNameBackend {
 
 	/** @var array */
 	private $groupCache = [];
@@ -292,4 +293,22 @@ public function getDisplayName(string $gid): string {
 
 		return $this->groupCache[$gid] ?? $gid;
 	}
+
+	public function setDisplayName(string $gid, string $displayName): bool {
+		if (!$this->groupExists($gid)) {
+			return false;
+		}
+		$displayName = trim($displayName);
+		if ($displayName === '') {
+			$displayName = $gid;
+		}
+
+		$qb = $this->dbc->getQueryBuilder();
+		$result = $qb->update(self::TABLE_GROUPS)
+			->set('displayname', $qb->createNamedParameter($displayName))
+			->where($qb->expr()->eq('gid', $qb->createNamedParameter($gid)))
+			->executeStatement();
+
+		return $result > 0;
+	}
 }