diff --git a/src/Unpacker.php b/src/Unpacker.php
index ac7a270d5..9ae15bea8 100644
--- a/src/Unpacker.php
+++ b/src/Unpacker.php
@@ -136,7 +136,7 @@ public function updateLock(Result $result, IOInterface $io): void
         $jsonContent = file_get_contents($json->getPath());
         $lockData['packages'] = array_values($lockData['packages']);
         $lockData['packages-dev'] = array_values($lockData['packages-dev']);
-        $lockData['content-hash'] = $locker->getContentHash($jsonContent);
+        $lockData['content-hash'] = Locker::getContentHash($jsonContent);
         $lockFile = new JsonFile(substr($json->getPath(), 0, -4).'lock', null, $io);
 
         if (!$this->dryRun) {