diff --git a/common.php b/common.php
index 90b8d1e6..2057e972 100644
--- a/common.php
+++ b/common.php
@@ -156,7 +156,7 @@ if (file_exists(BASE . 'config.local.php')) {
 
 /** @var array $config */
 ini_set('log_errors', 1);
-if(@$config['env'] === 'dev') {
+if(@$config['env'] === 'dev' || defined('MYAAC_INSTALL')) {
 	ini_set('display_errors', 1);
 	ini_set('display_startup_errors', 1);
 	error_reporting(E_ALL);
diff --git a/install/index.php b/install/index.php
index d6043d42..6536829e 100644
--- a/install/index.php
+++ b/install/index.php
@@ -3,9 +3,9 @@
 use Twig\Environment as Twig_Environment;
 use Twig\Loader\FilesystemLoader as Twig_FilesystemLoader;
 
-require '../common.php';
+const MYAAC_INSTALL = true;
 
-define('MYAAC_INSTALL', true);
+require '../common.php';
 
 // includes
 require SYSTEM . 'functions.php';