diff --git a/src/Composer/Repository/ComposerRepository.php b/src/Composer/Repository/ComposerRepository.php
index b4ec499d4..9959a326f 100644
--- a/src/Composer/Repository/ComposerRepository.php
+++ b/src/Composer/Repository/ComposerRepository.php
@@ -508,7 +508,7 @@ class ComposerRepository extends ArrayRepository implements ConfigurableReposito
         return array();
     }
 
-    private function configurePackageTransportOptions(PackageInterface $package)
+    protected function configurePackageTransportOptions(PackageInterface $package)
     {
         foreach ($package->getDistUrls() as $url) {
             if (strpos($url, $this->baseUrl) === 0) {