diff --git a/src/Composer/Factory.php b/src/Composer/Factory.php
index 3f4812927..8c01066ad 100644
--- a/src/Composer/Factory.php
+++ b/src/Composer/Factory.php
@@ -83,6 +83,7 @@ class Factory
             foreach ($packageConfig['repositories'] as $repo) {
                 if (isset($repo['packagist']) && $repo['packagist'] === false) {
                     $loadPackagist = false;
+                    break;
                 }
             }
         }