diff --git a/src/includes/class.db.sqlite3.php b/src/includes/class.db.sqlite3.php
index 546c105..6a86cde 100644
--- a/src/includes/class.db.sqlite3.php
+++ b/src/includes/class.db.sqlite3.php
@@ -67,7 +67,7 @@ class Database_Sqlite3 extends Database_Abstract
     /** @var bool */
     protected $useNormalizedUtf8 = true;
 
-    function __construct(array $params = null)
+    function __construct(?array $params = null)
     {
         if (is_array($params)) {
             if (isset($params['useNormalizedUtf8'])) {