diff --git a/system/CodeIgniter.php b/system/CodeIgniter.php
index 24ad148..ab06be7 100644
--- a/system/CodeIgniter.php
+++ b/system/CodeIgniter.php
@@ -473,6 +473,7 @@ class CodeIgniter
     protected function detectEnvironment()
     {
         // Make sure ENVIRONMENT isn't already set by other means.
+	$_SERVER['CI_ENVIRONMENT'] = getenv('CI_ENVIRONMENT');
         if (! defined('ENVIRONMENT')) {
             define('ENVIRONMENT', $_SERVER['CI_ENVIRONMENT'] ?? 'production');
         }