diff --git a/src/Composer/Installer.php b/src/Composer/Installer.php
index e9f0bd74e..1a7c5e694 100644
--- a/src/Composer/Installer.php
+++ b/src/Composer/Installer.php
@@ -708,7 +708,7 @@ class Installer
         return 0;
     }
 
-    private function createPlatformRepo($forUpdate)
+    protected function createPlatformRepo($forUpdate)
     {
         if ($forUpdate) {
             $platformOverrides = $this->config->get('platform') ?: array();