diff --git a/classes/UpgradeTools/CoreUpgrader/CoreUpgrader.php b/classes/UpgradeTools/CoreUpgrader/CoreUpgrader.php
index 932174952..467af9032 100644
--- a/classes/UpgradeTools/CoreUpgrader/CoreUpgrader.php
+++ b/classes/UpgradeTools/CoreUpgrader/CoreUpgrader.php
@@ -419,7 +419,7 @@ protected function runSqlQuery($upgrade_file, $query)
         }
     }
 
-    protected function writeNewSettings()
+    public function writeNewSettings()
     {
         // Do nothing
     }
diff --git a/classes/UpgradeTools/CoreUpgrader/CoreUpgrader16.php b/classes/UpgradeTools/CoreUpgrader/CoreUpgrader16.php
index 74559b34e..c7626b7f1 100644
--- a/classes/UpgradeTools/CoreUpgrader/CoreUpgrader16.php
+++ b/classes/UpgradeTools/CoreUpgrader/CoreUpgrader16.php
@@ -33,6 +33,9 @@
 
 class CoreUpgrader16 extends CoreUpgrader
 {
+    /**
+     * Generate a new settings file.
+     */
     public function writeNewSettings()
     {
         if (!defined('_PS_CACHE_ENABLED_')) {
diff --git a/classes/UpgradeTools/SettingsFileWriter.php b/classes/UpgradeTools/SettingsFileWriter.php
index 0640dcea8..82a3be656 100644
--- a/classes/UpgradeTools/SettingsFileWriter.php
+++ b/classes/UpgradeTools/SettingsFileWriter.php
@@ -65,12 +65,12 @@ public function writeSettingsFile($filePath, $data)
         $filesystem->copy($filePath, $filePath.'.bck');
 
         $fd = fopen($filePath, 'w');
+        fwrite($fd, '<?php'.PHP_EOL);
         foreach ($data as $name => $value) {
-            if (false === fwrite($fd, 'define(\''.$name.'\', \''.$this->checkString($value).'\');'."\n")) {
+            if (false === fwrite($fd, 'define(\''.$name.'\', \''.$this->checkString($value).'\');'.PHP_EOL)) {
                 throw new UpgradeException($this->translator->trans('Error when generating new settings.inc.php file.'));
             }
         }
-        fwrite($fd, '?>'."\n");
         fclose($fd);
     }
 
diff --git a/tests/SettingsFileWriterTest.php b/tests/SettingsFileWriterTest.php
new file mode 100644
index 000000000..06ede7212
--- /dev/null
+++ b/tests/SettingsFileWriterTest.php
@@ -0,0 +1,83 @@
+<?php
+/*
+ * 2007-2018 PrestaShop
+ * 
+ * NOTICE OF LICENSE
+ * 
+ * This source file is subject to the Open Software License (OSL 3.0)
+ * that is bundled with this package in the file LICENSE.txt.
+ * It is also available through the world-wide-web at this URL:
+ * http://opensource.org/licenses/osl-3.0.php
+ * If you did not receive a copy of the license and are unable to
+ * obtain it through the world-wide-web, please send an email
+ * to license@prestashop.com so we can send you a copy immediately.
+ * 
+ * DISCLAIMER
+ * 
+ * Do not edit or add to this file if you wish to upgrade PrestaShop to newer
+ * versions in the future. If you wish to customize PrestaShop for your
+ * needs please refer to http://www.prestashop.com for more information.
+ * 
+ *  @author PrestaShop SA <contact@prestashop.com>
+ *  @copyright  2007-2018 PrestaShop SA
+ *  @license    http://opensource.org/licenses/osl-3.0.php  Open Software License (OSL 3.0)
+ *  International Registered Trademark & Property of PrestaShop SA
+ */
+
+use PHPUnit\Framework\TestCase;
+
+use PrestaShop\Module\AutoUpgrade\UpgradeTools\SettingsFileWriter;
+use PrestaShop\Module\AutoUpgrade\UpgradeContainer;
+
+class SettingsFileWriterTest extends TestCase
+{
+    private $container;
+    private $settingsWriter;
+
+    protected function setUp()
+    {
+        parent::setUp();
+        $this->container = new UpgradeContainer('/html', '/html/admin');
+        $this->settingsWriter = new SettingsFileWriter($this->container->getTranslator());
+    }
+
+    public function testSettingsIsProperlyGenerated()
+    {
+        $fileExpected = "<?php
+define('_DB_SERVER_', '127.0.0.1:3307');
+define('_DB_NAME_', 'prestashop16');
+define('_DB_USER_', 'root');
+define('_DB_PREFIX_', 'ps_');
+define('_MYSQL_ENGINE_', 'InnoDB');
+define('_PS_CACHING_SYSTEM_', 'CacheMemcache');
+define('_PS_CACHE_ENABLED_', '0');
+define('_COOKIE_KEY_', 'dedeedededede');
+define('_COOKIE_IV_', 'wololo');
+define('_PS_CREATION_DATE_', '2018-05-16');
+define('_PS_VERSION_', '1.6.1.18');
+define('_RIJNDAEL_KEY_', 'zrL1GDp2oqDoXFss');
+define('_RIJNDAEL_IV_', 'QSt/I95YtA==');
+";
+
+        $datas = array(
+            '_DB_SERVER_' => '127.0.0.1:3307',
+            '_DB_NAME_' => 'prestashop16',
+            '_DB_USER_' => 'root',
+            '_DB_PREFIX_' => 'ps_',
+            '_MYSQL_ENGINE_' => 'InnoDB',
+            '_PS_CACHING_SYSTEM_' => 'CacheMemcache',
+            '_PS_CACHE_ENABLED_' => '0',
+            '_COOKIE_KEY_' => 'dedeedededede',
+            '_COOKIE_IV_' => 'wololo',
+            '_PS_CREATION_DATE_' => '2018-05-16',
+            '_PS_VERSION_' => '1.6.1.18',
+            '_RIJNDAEL_KEY_' => 'zrL1GDp2oqDoXFss',
+            '_RIJNDAEL_IV_' => 'QSt/I95YtA==',
+        );
+
+        $file = tempnam(sys_get_temp_dir(), 'PSS');
+        $this->settingsWriter->writeSettingsFile($file, $datas);
+
+        $this->assertSame($fileExpected, file_get_contents($file));
+    }
+}