diff --git a/www/install.php b/www/install.php
index 3b62aebd26..b0f614ef03 100644
--- a/www/install.php
+++ b/www/install.php
@@ -27,7 +27,7 @@ if(!isset($_SESSION['installing']) and isset($config->installed) and $config->in
 
 /* Reset the config params to make sure the install program will be lauched. */
 $config->set('requestType', 'GET');
-$config->set('debug', true);
+$config->set('debug', false);
 $config->set('default.module', 'install');
 $app->setDebug();
 
diff --git a/www/upgrade.php b/www/upgrade.php
index 6e78d510e7..7746b063d9 100644
--- a/www/upgrade.php
+++ b/www/upgrade.php
@@ -32,7 +32,7 @@ $common = $app->loadCommon();
 
 /* Reset the config params to make sure the install program will be lauched. */
 $config->set('requestType', 'GET');
-$config->set('debug', true);
+$config->set('debug', false);
 $config->set('default.module', 'upgrade');
 $app->setDebug();