diff --git a/lib/modules/manager/nix/extract.ts b/lib/modules/manager/nix/extract.ts
index fe4e4c723ee51f..958b97380f7e81 100644
--- a/lib/modules/manager/nix/extract.ts
+++ b/lib/modules/manager/nix/extract.ts
@@ -109,6 +109,7 @@ export function extractPackageFile(
           currentDigest: flakeLocked.rev,
           replaceString: flakeLocked.rev,
           datasource: GitRefsDatasource.id,
+          // istanbul ignore next: type tarball always contains this link
           packageName: (flakeOriginal.url ?? '').replace(
             lockableHTTPTarballProtocol,
             'https://$1/$2/$3',