diff --git a/src/Composer/Downloader/DownloadManager.php b/src/Composer/Downloader/DownloadManager.php
index 736baf920..7616229cb 100644
--- a/src/Composer/Downloader/DownloadManager.php
+++ b/src/Composer/Downloader/DownloadManager.php
@@ -401,7 +401,8 @@ class DownloadManager
     }
 
     /**
-     * @return array<'dist'|'source'>&non-empty-array
+     * @return string[]
+     * @phpstan-return array<'dist'|'source'>&non-empty-array
      */
     private function getAvailableSources(PackageInterface $package, PackageInterface $prevPackage = null)
     {