diff --git a/src/Pecee/Http/Request.php b/src/Pecee/Http/Request.php
index 31dc0ae..e2bccae 100644
--- a/src/Pecee/Http/Request.php
+++ b/src/Pecee/Http/Request.php
@@ -167,7 +167,7 @@ class Request
         }
 
         if ($this->getHeader('http-x-forwarded-for') !== null) {
-            return $this->getHeader('http-x-forwarded_for');
+            return $this->getHeader('http-x-forwarded-for');
         }
 
         return $this->getHeader('remote-addr');