diff --git a/src/core/Curl/Handler.php b/src/core/Curl/Handler.php
index 30ea4de2..d98964e5 100644
--- a/src/core/Curl/Handler.php
+++ b/src/core/Curl/Handler.php
@@ -13,9 +13,9 @@
 
 namespace Swoole\Curl;
 
-use Swoole;
 use Swoole\Constant;
 use Swoole\Coroutine\Http\Client;
+use Swoole\Coroutine\System;
 use Swoole\Curl\Exception as CurlException;
 use Swoole\Http\Status;
 
@@ -717,7 +717,7 @@ private function execute()
                 }
 
                 if (!filter_var($proxy, FILTER_VALIDATE_IP)) {
-                    $ip = Swoole\Coroutine::gethostbyname($proxy, AF_INET, $this->clientOptions['connect_timeout'] ?? -1);
+                    $ip = System::gethostbyname($proxy, AF_INET, $this->clientOptions['connect_timeout'] ?? -1);
                     if (!$ip) {
                         $this->setError(CURLE_COULDNT_RESOLVE_PROXY, 'Could not resolve proxy: ' . $proxy);
                         return false;
diff --git a/src/std/exec.php b/src/std/exec.php
index 514eaf6a..e4eb212f 100644
--- a/src/std/exec.php
+++ b/src/std/exec.php
@@ -9,9 +9,11 @@
 
 declare(strict_types=1);
 
+use Swoole\Coroutine\System;
+
 function swoole_exec(string $command, &$output = null, &$returnVar = null)
 {
-    $result = Swoole\Coroutine::exec($command);
+    $result = System::exec($command);
     if ($result) {
         $outputList = explode(PHP_EOL, $result['output']);
         foreach ($outputList as &$value) {
@@ -34,7 +36,7 @@ function swoole_exec(string $command, &$output = null, &$returnVar = null)
 
 function swoole_shell_exec(string $cmd)
 {
-    $result = Swoole\Coroutine::exec($cmd);
+    $result = System::exec($cmd);
     if ($result && $result['output'] !== '') {
         return $result['output'];
     }