diff --git a/install-new/models/install.php b/install-new/models/install.php
index 4e2e1bc35..3e366a0c9 100644
--- a/install-new/models/install.php
+++ b/install-new/models/install.php
@@ -81,7 +81,7 @@ class InstallModelInstall extends InstallAbstractModel
 			$this->setError($this->language->l('%s file is not writable (check permissions)', self::SETTINGS_FILE));
 			return false;
 		}
-		else if (!file_exists(_PS_ROOT_DIR_.'/'.self::SETTINGS_FILE) && !is_writable(_PS_ROOT_DIR.'/'.dirname(self::SETTINGS_FILE)))
+		else if (!file_exists(_PS_ROOT_DIR_.'/'.self::SETTINGS_FILE) && !is_writable(_PS_ROOT_DIR_.'/'.dirname(self::SETTINGS_FILE)))
 		{
 			$this->setError($this->language->l('%s folder is not writable (check permissions)', dirname(self::SETTINGS_FILE)));
 			return false;