diff --git a/src/SPC/builder/extension/swoole_hook_mysql.php b/src/SPC/builder/extension/swoole_hook_mysql.php
index b7c9b8c1..55a58af3 100644
--- a/src/SPC/builder/extension/swoole_hook_mysql.php
+++ b/src/SPC/builder/extension/swoole_hook_mysql.php
@@ -30,7 +30,7 @@ class swoole_hook_mysql extends Extension
             return;
         }
         putenv('EXTENSION_DIR=' . BUILD_MODULES_PATH);
-        [$ret, $out] = shell()->execWithResult(BUILD_ROOT_PATH . '/bin/php -n'. $this->getSharedExtensionLoadString() . ' --ri "swoole"', false);
+        [$ret, $out] = shell()->execWithResult(BUILD_ROOT_PATH . '/bin/php -n' . $this->getSharedExtensionLoadString() . ' --ri "swoole"', false);
         $out = implode('', $out);
         if ($ret !== 0) {
             throw new RuntimeException('extension ' . $this->getName() . ' failed compile check: php-cli returned ' . $ret);