diff --git a/src/Composer/Repository/RepositoryFactory.php b/src/Composer/Repository/RepositoryFactory.php
index ca479a7fd..5d3a2a61f 100644
--- a/src/Composer/Repository/RepositoryFactory.php
+++ b/src/Composer/Repository/RepositoryFactory.php
@@ -94,6 +94,9 @@ class RepositoryFactory
         if (!$config) {
             $config = Factory::createConfig($io);
         }
+        if ($io) {
+            $io->loadConfiguration($config);
+        }
         if (!$rm) {
             if (!$io) {
                 throw new \InvalidArgumentException('This function requires either an IOInterface or a RepositoryManager');