diff --git a/application/config/config.php b/application/config/config.php
index 689728e4..51b54253 100644
--- a/application/config/config.php
+++ b/application/config/config.php
@@ -315,7 +315,7 @@ $config['cache_busting_token'] = '824HX';
 | MUST set an encryption key.  See the user guide for info.
 |
 */
-$config['encryption_key'] = Config::BASE_URL;
+$config['encryption_key'] = base64_encode(APPPATH);
 
 /*
 |--------------------------------------------------------------------------