diff --git a/app/Config/Constants.php b/app/Config/Constants.php
index 3f7cef1b8c6f..b25f71cdcc26 100644
--- a/app/Config/Constants.php
+++ b/app/Config/Constants.php
@@ -11,7 +11,7 @@
 // NOTE: changing this will require manually modifying the
 // existing namespaces of App\* namespaced-classes.
 //
-define('APP_NAMESPACE', 'App');
+defined('APP_NAMESPACE') || define('APP_NAMESPACE', 'App');
 
 /*
 |--------------------------------------------------------------------------
@@ -21,7 +21,7 @@
 | The path that Composer's autoload file is expected to live. By default,
 | the vendor folder is in the Root directory, but you can customize that here.
 */
-define('COMPOSER_PATH', ROOTPATH . 'vendor/autoload.php');
+defined('COMPOSER_PATH') || define('COMPOSER_PATH', ROOTPATH . 'vendor/autoload.php');
 
 /*
 |--------------------------------------------------------------------------