diff --git a/httpbin/helpers.py b/httpbin/helpers.py
index aef1119d..b29e1835 100644
--- a/httpbin/helpers.py
+++ b/httpbin/helpers.py
@@ -48,7 +48,6 @@
     'X-Heroku-Queue-Wait-Time',
     'X-Forwarded-For',
     'X-Heroku-Dynos-In-Use',
-    'X-Forwarded-For',
     'X-Forwarded-Protocol',
     'X-Forwarded-Port',
     'X-Request-Id',