diff --git a/lib/Splash/Chargify/Client.php b/lib/Splash/Chargify/Client.php
index b7e7a4c..1feb7c7 100644
--- a/lib/Splash/Chargify/Client.php
+++ b/lib/Splash/Chargify/Client.php
@@ -149,7 +149,7 @@ public function setCurl($curl) {
     public function getCurl() {
         if ($this->curl === null) {
             $this->curl = curl_init();
-            
+
             curl_setopt_array($this->curl, array(
                 CURLOPT_SSL_VERIFYPEER => false,
                 CURLOPT_SSL_VERIFYHOST => 2,
@@ -158,6 +158,9 @@ public function getCurl() {
                 CURLOPT_RETURNTRANSFER => true,
                 CURLOPT_CONNECTTIMEOUT => 10,
                 CURLOPT_TIMEOUT        => 30,
+                //Using integer value instead constant because in CentOS
+                //Curl uses NSS and there CURL_SSLVERSION_TLSv1_2 is undefined
+                CURLOPT_SSLVERSION     => 6,
             ));
         }
 
@@ -263,4 +266,4 @@ protected function getCacheKey($uri, $data, $method, $hydrate) {
 
         return null;
     }
-}
\ No newline at end of file
+}