diff --git a/app/Services/Backup/BackupDestinations/S3.php b/app/Services/Backup/BackupDestinations/S3.php
index 01e51407..0792f254 100644
--- a/app/Services/Backup/BackupDestinations/S3.php
+++ b/app/Services/Backup/BackupDestinations/S3.php
@@ -6,6 +6,7 @@
 
 use App\Services\Backup\Contracts\BackupDestinationInterface;
 use App\Services\Backup\Traits\BackupHelpers;
+use Aws\Api\DateTimeResult;
 use Aws\S3\S3Client;
 use Illuminate\Support\Facades\Log;
 use League\Flysystem\AwsS3V3\AwsS3V3Adapter;
@@ -39,7 +40,7 @@ public function listFiles(string $pattern): array
             ->filter(function (array $file) use ($pattern): bool {
                 return str_contains($file['Key'], $pattern);
             })
-            ->sortByDesc(function (array $file): string {
+            ->sortByDesc(function (array $file): DateTimeResult {
                 return $file['LastModified'];
             })
             ->toArray();