diff --git a/src/Auth/APIKey.php b/src/Auth/APIKey.php
index c7eda4bc..6246afb8 100644
--- a/src/Auth/APIKey.php
+++ b/src/Auth/APIKey.php
@@ -22,7 +22,8 @@ public function getHeaders(): array
     {
         return [
             'X-Auth-Email'   => $this->email,
-            'X-Auth-Key' => $this->apiKey
+            'X-Auth-Key' => $this->apiKey,
+            'Authorization' => $this->apiKey
         ];
     }
 }