diff --git a/src/Composer/Util/AuthHelper.php b/src/Composer/Util/AuthHelper.php
index 5a3f950c7..94177e2b4 100644
--- a/src/Composer/Util/AuthHelper.php
+++ b/src/Composer/Util/AuthHelper.php
@@ -235,6 +235,8 @@ class AuthHelper
                 $this->io->writeError($authenticationDisplayMessage, true, IOInterface::DEBUG);
                 $this->displayedOriginAuthentications[] = $origin;
             }
+        } elseif (in_array($origin, array('api.bitbucket.org', 'api.github.com'), true)) {
+            return $this->addAuthenticationHeader($headers, str_replace('api.', '', $origin), $url);
         }
 
         return $headers;