diff --git a/lib/WebDriver/Service/CurlService.php b/lib/WebDriver/Service/CurlService.php
index 254b8e00..2338746e 100755
--- a/lib/WebDriver/Service/CurlService.php
+++ b/lib/WebDriver/Service/CurlService.php
@@ -132,7 +132,7 @@ public function execute($requestMethod, $url, $parameters = null, $extraOptions
             throw $e;
         }
 
-        curl_close($curl);
+        $curl = null;
 
         return array($rawResult, $info);
     }