diff --git a/lib/PayPal/Core/PayPalHttpConnection.php b/lib/PayPal/Core/PayPalHttpConnection.php
index e1810aa..ea0dffd 100644
--- a/lib/PayPal/Core/PayPalHttpConnection.php
+++ b/lib/PayPal/Core/PayPalHttpConnection.php
@@ -77,7 +77,11 @@ class PayPalHttpConnection
 
         //Initialize Curl Options
         $ch = curl_init($this->httpConfig->getUrl());
-        curl_setopt_array($ch, $this->httpConfig->getCurlOptions());
+        $options = $this->httpConfig->getCurlOptions();
+        if(empty($options[CURLOPT_HTTPHEADER])) {
+            unset ($options[CURLOPT_HTTPHEADER]);
+        }
+        curl_setopt_array($ch, $options);
         curl_setopt($ch, CURLOPT_URL, $this->httpConfig->getUrl());
         curl_setopt($ch, CURLOPT_HEADER, true);
         curl_setopt($ch, CURLINFO_HEADER_OUT, true);