diff --git a/castle/configuration.py b/castle/configuration.py
index 88bdcc2..5206407 100644
--- a/castle/configuration.py
+++ b/castle/configuration.py
@@ -26,6 +26,7 @@
     "Upgrade-Insecure-Requests",
     "User-Agent",
     "X-Castle-Client-Id",
+    "X-Requested-With",
 ]
 
 # API endpoint