diff --git a/tests/LoadTest.php b/tests/LoadTest.php
index 4e402aa..388827b 100644
--- a/tests/LoadTest.php
+++ b/tests/LoadTest.php
@@ -70,7 +70,9 @@ class LoadTest extends PHPUnit_Framework_TestCase
         $autoload = require(self::$file);
         $this->assertNotEmpty($autoload);
         
-        define('DEBUG', true);
+        if(!defined('DEBUG')) {
+            define('DEBUG', true);
+        }
         Load::autoload('Func');
         Load::autoload('Captcha');        
     }