diff --git a/composer.json b/composer.json
index 879b082..441ab33 100644
--- a/composer.json
+++ b/composer.json
@@ -5,7 +5,7 @@
     "license": "None",
     "require": {
         "php": ">=5.4.0",
-
+        "ext-curl": "*",
         "react/promise": "~2.0",
         "react/event-loop": "*",
         "khr/php-mcurl-client": "3.*"
diff --git a/src/Curl.php b/src/Curl.php
index 500606f..036ecb4 100644
--- a/src/Curl.php
+++ b/src/Curl.php
@@ -13,7 +13,7 @@ class Curl {
     public $loop;
 
     /**
-     * @var \React\EventLoop\Timer\TimerInterface
+     * @var \React\EventLoop\TimerInterface
      */
     public $loop_timer;
 
@@ -35,7 +35,7 @@ public function __construct($loop) {
         $this->loop = $loop;
         $this->client = new \MCurl\Client();
         $this->client->isSelect(false);
-        $this->client->setClassResult('\\KHR\\React\Curl\\Result');
+        $this->client->setClassResult('\KHR\React\Curl\Result');
     }
 
     /**
@@ -95,7 +95,7 @@ public function run() {
             $this->loop_timer = $this->loop->addPeriodicTimer($this->timeout, function() {
                 $this->run();
                 if (!($this->client->run() || $this->client->has())) {
-                    $this->loop_timer->cancel();
+                    $this->loop->cancelTimer($this->loop_timer);
                     $this->loop_timer = null;
                 }
             });