diff --git a/platformio/package/manager/_registry.py b/platformio/package/manager/_registry.py
index 80d42889..e488b5b3 100644
--- a/platformio/package/manager/_registry.py
+++ b/platformio/package/manager/_registry.py
@@ -54,6 +54,7 @@ class RegistryFileMirrorIterator(object):
             params=dict(bypass=",".join(self._visited_mirrors))
             if self._visited_mirrors
             else None,
+            x_with_authorization=RegistryClient.allowed_private_packages(),
         )
         stop_conditions = [
             response.status_code not in (302, 307),