diff --git a/lib/Alchemy/Phrasea/Core.php b/lib/Alchemy/Phrasea/Core.php
index 3774d358b8..94697297e3 100644
--- a/lib/Alchemy/Phrasea/Core.php
+++ b/lib/Alchemy/Phrasea/Core.php
@@ -67,8 +67,8 @@ class Core extends \Pimple
     /**
      * Cache Autoload if it's not debug mode
      */
-    static::initAutoloads(!$this->configuration->isDebug());
-
+    static::initAutoloads($this->configuration->isInstalled() && !$this->configuration->isDebug());
+    
     $this->init();
 
     /**