diff --git a/lib/core/AxiosHeaders.js b/lib/core/AxiosHeaders.js
index b2f1c2fe76..b9fc6d045a 100644
--- a/lib/core/AxiosHeaders.js
+++ b/lib/core/AxiosHeaders.js
@@ -266,7 +266,7 @@ class AxiosHeaders {
   }
 }
 
-AxiosHeaders.accessor(['Content-Type', 'Content-Length', 'Accept', 'Accept-Encoding', 'User-Agent']);
+AxiosHeaders.accessor(['Content-Type', 'Content-Length', 'Accept', 'Accept-Encoding', 'User-Agent', 'Authorization']);
 
 utils.freezeMethods(AxiosHeaders.prototype);
 utils.freezeMethods(AxiosHeaders);