diff --git a/webman.php b/webman.php
index 1cd5d9d..96e44ec 100644
--- a/webman.php
+++ b/webman.php
@@ -7,7 +7,7 @@ use Workerman\Worker;
 Adapterman::init();
 
 $http_worker                = new Worker('http://127.0.0.1:7010');
-$http_worker->count         = getenv('WEBMAN_WORKERS') ?? (swoole_cpu_num() ?? 1);
+$http_worker->count         = getenv('WEBMAN_WORKERS') ?: (swoole_cpu_num() ?: 1);
 $http_worker->name          = 'AdapterMan';
 
 $http_worker->onWorkerStart = static function () {