diff --git a/main.php b/main.php
index 555537462..743eff331 100644
--- a/main.php
+++ b/main.php
@@ -95,7 +95,8 @@ require_once("core/model/DB.php");
 
 // Redirect to the installer if no database is selected
 if(!isset($databaseConfig) || !isset($databaseConfig['database']) || !$databaseConfig['database']) {
-	$installURL = dirname(dirname($_SERVER['SCRIPT_NAME'])) . '/install.php';
+	$s = (isset($_SERVER['SSL']) || (isset($_SERVER['HTTPS']) && $_SERVER['HTTPS'] != 'off')) ? 's' : '';
+	$installURL = "http$s://" . $_SERVER['HTTP_HOST'] . dirname(dirname($_SERVER['SCRIPT_NAME'])) . '/install.php';
 	header("Location: $installURL");
 	die();
 }