diff --git a/README.md b/README.md
index 44566d9a..c172fc4a 100644
--- a/README.md
+++ b/README.md
@@ -3,6 +3,8 @@
 - 需要 GCC-9 以上版本，支持 C++17 标准
 - 需要 CMake-3.24 以上版本
 
+> 预览版目前仅支持 `Linux` 系统，建议使用 `Ubuntu 22.04`
+
 ## PHP
 必须包含 embed 模块
 
@@ -11,7 +13,7 @@
 进入 `vendor/swoole/phpx` 目录，编译 `phpx`
 
 ```shell
-vendor/swoole/phpx
+cd vendor/swoole/phpx
 cmake .
 make -j32
 ```
diff --git a/src/Php/CompilerBase.php b/src/Php/CompilerBase.php
index f2f730d7..1092a3dc 100644
--- a/src/Php/CompilerBase.php
+++ b/src/Php/CompilerBase.php
@@ -158,7 +158,7 @@ class CompilerBase extends \PhpAot\Core\Translator
     protected string $ldflags = '';
     protected int $floatPrecision = 17;
     protected bool $debugInfo = false;
-    protected bool $formatCode = false;
+    protected bool $formatCode = true;
     protected bool $printBacktraceOnError = false;
     protected bool $noLiteralStrings = false;
     protected string $file;
diff --git a/src/Php/Translator.php b/src/Php/Translator.php
index aeec5a92..c2ae1a36 100644
--- a/src/Php/Translator.php
+++ b/src/Php/Translator.php
@@ -484,7 +484,7 @@ CODE;
         $code .= '// register constants' . PHP_EOL;
         foreach ($this->constants as $name => $const) {
             $code .= "{$name} = {$const->value};\n";
-            $code .= 'php::define(' . $this->genCharPtr($const->name) . ', ' . $name . ');' . PHP_EOL;
+            $code .= 'php::define(' . $this->genCharPtr($const->name, true) . ', ' . $name . ');' . PHP_EOL;
         }
         $code .= '// global vars ' . PHP_EOL;
         foreach ($this->globalVars as $name => $type) {